What Is a Credit Card: How It Works, Types, Pros and Cons

Today, there are billions of credit cards used all around the world. 

In the UK specifically, there were 360 million credit card transactions in January 2026 – 3.6% more than in January 2025, with a total spend of £21.4 billion.

But how much do you really know about that rectangular piece of plastic in your wallet? 

In this blog post, we explore what is a credit card, how it works, what its pros and cons are, and more.

What Is a Credit Card?

A credit card is a physical card issued by financial institutions like banks. 

It’s a plastic card that conforms to global ISO standards for banking, and it enables users to make purchases or withdraw cash by borrowing funds from the bank. 

Credit cardholders are then charged an interest rate and other fees for the cost of borrowing money.  

How Does a Credit Card Work?

A credit card gives you access to a pre-approved line of credit, allowing you to borrow money up to a set credit limit for everyday purchases, online payments, or even cash withdrawals. 

This line of credit needs to be paid back over time, usually with some type of interest rate. 

The average credit card interest rate is now 24.66% in the UK. You can also do a cash advance, but keep in mind that the charges for this can be quite high.

How Do Credit Card Payments Work?

Borrowing money from your card issuer to make a purchase is a process that goes through several stages.

First, a customer initiates a payment using a credit card, and the merchant sends a request to the card issuer for approval. The issuer verifies whether there is available credit and approves or declines the transaction. 

If the payment is approved, the transaction is processed through a card network like Visa or Mastercard. The issuer pays the merchant on behalf of the customer, and the amount is added to their credit card balance.

All transactions are grouped into a billing cycle, where at the end, the credit card owner receives a statement showing their total balance, minimum payment due, and the payment due date. 

Key Features of a Credit Card

A credit card has the following characteristics: 

• EMV chip – A small metallic computer chip embedded in the card that stores encrypted payment data;
  
• The cardholder’s name and account number – The name of the card owner and the unique card number linked to the account that helps identify the account holder and the payment account used for purchases;
  
• Card expiration date – The month and year until the card is valid;
  
• Issuer logo – The logo of the bank or financial institution that issued the card;
  
• Card scheme logo – The logo of the payment network, such as Visa or Mastercard;
  
• Magnetic strip – A black strip containing encoded card information which allows the card to be swiped in payment terminals;
  
• Customer service number – Contact number for assistance from the card issuer, which can be used to report lost or stolen cards, ask questions, and more;
  
• Signature box – A white strip where the cardholder signs their name so the cardholder’s identity can be verified;
  
• CVV number – A 3- or 4-digit security code that provides extra security for online or phone transactions where the physical card is not present. 

The latter four features appear on the back of the credit card, while the first five are located on the front side of the card, although this varies across cards. 

Understanding Interest, Grace Periods, and Minimum Payments

It’s important to note that, according to some countries’ laws and regulations, credit card issuers are obliged to provide a minimum of a 21-day grace period before cardholders are required to pay interest. If you pay your full balance within this time, you won’t be charged any interest on your purchase.

If you don’t pay the full balance, interest is applied to the remaining amount based on your card’s APR or Annual Percentage Rate. 

In cases when the balance is not paid in full, cardholders may be required to make a minimum payment (a minor percentage of the outstanding balance).

Make sure that you understand the credit card interest accumulation methods that your card issuer works with. This is especially important when transferring credit card debt – if you plan to send your credit card balance to a card with a lower interest rate.

Types of Credit Cards

Credit card holders around the world can make use of different types of credit cards, which vary based on purpose and credit profile.

Credit Cards By Purpose 

Depending on the purpose they serve, credit cards can fall into the following categories:

• Rewards Credit Cards offer credits for goods or services. These can range from airline travel to hotel stays, and even cashback. The rewards you receive will depend on how much you spend, with the corollary that the more you spend, the higher the rewards you earn.
  
• Balance Transfer Credit Cards have an introductory interest rate and, most times, offer “a lower fee on balance credit card transfers.”
  
• Travel Credit Cards are perfect for overseas travel because they rarely incur overseas fees. They are great for managing your holiday expenses as well as avoiding cash transactions when using a credit card abroad.
  
• Retail Credit Cards are usually issued by a large retailer or store. It is typically specifically limited to making purchases at that retailer, and it often gives the cardholder a discount on the first purchase.

The right type of credit card from this list will depend entirely on personal preferences and requirements. 

Cards By Credit Profile

On the other hand, cards can differ based on their credit profile. 

For instance, some of the different types of credit cards under this category include:

• Secured Credit Cards – commonly issued in the US, and are mainly used by people with lower credit scores. In order to use your card, you need to prove that you have the funds first. This means that you’ll need to put down a cash deposit before you can use this type of card at retailers or stores. Unsecured credit cards, which are more popular in the UK, don’t come with any obligations when it comes to security deposits or collateral.
  
• Credit Builder Credit Cards – ideal for individuals with a low credit score. This type of card helps them build a stronger credit rating, as it helps them use the credit allocated responsibly. Typically, these cards have borrowing limits that are lower than usual and charge interest rates that are higher than most, acting as an incentive for responsible borrowing.

These credit card options are specifically designed for different consumer profiles. 

Premium Credit Cards 

There’s another, standalone category of credit card types – premium credit cards. Although these cards usually come with higher annual fees, they offer perks that don’t really come with regular credit cards. 

With such cards, you could enjoy special events, concierge services, access to airport lounges, additional insurance coverage, and more.

Advantages of Using a Credit Card

Beyond the inherent advantages of credit plans, financial institutions use various incentives to attract new cardholders and create new benefits for users. 

For example, if you compare different offers carefully, you may be able to qualify for a 0% introductory credit card that charges no interest on purchases or balance transfers for a promotional period, typically ranging from 12 to 18 months.

Credit cards offer a wide range of benefits, and to really understand their value, we’ll group them into four core categories.

Financial Flexibility

One of the biggest advantages of a credit card is the ability to manage your cash flow more effectively and enjoy flexible borrowing.

This can lead to the following benefits:

• Spreading the costs around – Some credit cards also offer you deals with zero or small interest rates for the first couple of months. This means that you can buy something expensive when you get your card and pay it off interest-free for the first few months while this offer is still available, spreading spending.
  
• Make emergency buys – Accidents happen all the time, and more often than not, they’re linked to unexpected costs. If you don’t have a large savings fund, credit cards can be really useful if your car breaks down and you need an emergency fix or another type of emergency crops up that you have to deal with.
  
• Debt consolidation – When it comes to managing existing debt, a credit card can come in handy. For example, if you get a credit card that offers lower interest rates than the debt you’re carrying, you can pay off the debts with your credit card and have one lump sum to pay off over a period with lower interest rates.
  
• Build your credit score – Managing a monthly budget and avoiding overspending means that you won’t fall into the scenario of credit card debt, an important element of your credit score. A strong credit score means you’re more likely to be approved for a credit request, such as a loan for a home. However, if you don’t yet have a credit history or you’ve defaulted on loans in the past, this may be a bit more difficult to get.

While credit cards can provide valuable financial flexibility, they are most effective when used strategically and responsibly. 

The features outlined above can help improve short-term cash flow and simplify debt management, but only if repayments are planned carefully.

Rewards and Perks 

Many credit cards go beyond basic functionality by offering incentives for everyday spending.

Some of them include the following:

• Earn rewards – Some credit card issuers appeal to users via extra bonuses or rewards, like airline miles, gift certificates, and others. This refers to what we know as rewards credit cards, which allow you to earn rewards or the so-called “loyalty points” when you make purchases.
  
• Zero interest or annual fee – In some cases, you may discover credit cards that offer zero percent interest, while others can even offer programmes with no annual fees. 

Rewards can make a credit card more valuable, but the benefits should always be weighed against interest rates, fees, and repayment terms. Choose a card whose perks match your spending habits and financial needs. 

Protection and Security 

Credit cards often provide stronger safeguards compared to other payment methods.

Here’s what you need to know about these protection and security mechanisms:

• Fraud protection – Credit cards are regulated and governed by policies like the Consumer Credit Act. Typically, they come with more fraud protection when compared to a general debit card account. For instance, the majority of credit card issuers provide free liability protection. In the case of debit cards, liability is based on your response to a lost or stolen card and how urgently you deal with the situation.
  
• Payment protection – Some credit cards also offer you protection on your payments if you make a purchase and the merchant you buy from goes under and cannot deliver. Check if your provider offers credit card protection and the minimum and maximum amounts covered. 

Credit card protection is only as strong as your awareness of it. Before using a new card for a significant purchase, take five minutes to review your issuer’s fraud liability policy and check what type of protection applies.

Keep a record of large transactions and retain merchant correspondence, as issuers will ask for evidence when processing a claim.

Convenience and Control

Modern credit cards are designed to make spending easier and more transparent.

The following features are attractive from the perspective of convenience and control:

• Seamless payments – The technological innovations that we’re witnessing today make the use of credit cards more convenient and reliable than ever. You can now add your credit card to your digital or mobile wallet and spend that way instead of having to carry and pay with cash. All you need for this is your smartphone.
  
• Track your spending – Your bank, financial institution, or building society that issued you with your credit card should send you a credit card statement each month. This monthly statement, as well as the online portal of your issuing institution, will help you keep track of your expenses.

Your monthly statement is more than a bill. It’s a financial audit you receive for free. 

Make it a habit to review every line item when your statement arrives, not just the total. This catches billing errors and unauthorised charges early, but it also gives you a clear picture of spending patterns that are easy to miss when you’re tapping and going.

Disadvantages of Credit Cards

As advantageous as credit cards may be, there are also a set of drawbacks and challenges worth addressing:

• Debt risk – because money isn’t automatically deducted from your bank account, you run into the situation of spending more than you have.
  
• High interest and fees – Credit card fees differ based on the type of credit card you own and how you’re using it. Credit card companies also charge interest rates for using their services. These are considered some of the highest-interest-rate debts consumers can access.
  
• Behavioural overspending –  for some consumers, access to a credit card can lead to behavioural overspending that can potentially create vulnerabilities in the future, when repaying the accumulated debt.

Treat your credit card limit as a ceiling that exists for the lender’s protection, not yours. 

A practical benchmark used by financial advisors is to keep your utilisation –  the share of your available credit you’re actually using – below 30% at any given time. So on a £3,000 limit, that means carrying no more than £900.

Credit Card Fees You Should Know About

Depending on how you use your credit card, certain fees apply. 

Here are the most common types of credit card fees you should know about:

• Foreign transaction fees – charged when you make purchases in a different currency or outside your home country and typically charge 2.75% to 3%;
  
• Balance transfer fees – applied when you move debt from one credit card to another and generally range from 1% to 3.5% of the transferred amount;
  
• Annual fees – a yearly charge for holding certain cards, often tied to rewards or premium benefits, ranging from roughly £25 to over £195 annually;
  
• Late fees – incurred if you miss a payment deadline – typically £12 in the UK;

Some providers may also charge fees if you exceed your credit limit, and both late and missed payments can negatively impact your credit score.

How Do Credit Cards Differ From Debit Cards?

Debit cards are different from credit cards as they are directly connected to your bank account. When you make a payment, the funds are taken out right away, meaning you can only spend the money you currently have available.

Here are the main differences between the two:

Feature	Credit Card	Debit Card
Source of funds	Borrowed money from the card issuer	Your own money from your bank account
Spending limit	Based on a pre-approved credit limit	Limited to your available account balance
Payment timing	Pay later	Paid immediately
Interest charges	Charged if the balance isn’t paid in full	No interest
Fees	Can include annual fees, late fees, balance transfer fees, and foreign transaction fees	Fewer fees, but may include overdraft or foreign transfer fees
Credit score impact	Builds and affects your credit score	Does not impact credit score
Cash withdrawals	Cash advances	ATM withdrawals from available funds

How to Get a Credit Card Step by Step

Getting a credit card isn’t complicated. However, your financial profile will determine which cards you qualify for and on what terms.

Step 1: Check your eligibility

Most UK credit card providers require you to meet a minimum set of criteria before you can apply:

• Age – you must be at least 18 years old.
• Residency – you must be a UK resident.
• Income – lenders want confidence you can meet repayments; some cards specify a minimum annual income (commonly £10,000 – £15,000, though this varies).
• Credit history – a record of borrowing and repaying responsibly works in your favour.  

Little or no credit history can limit your options, though some cards are specifically designed for people building credit for the first time

Step 2: Understand your credit score

Your credit score is a numerical rating that reflects how reliably you’ve managed credit and debt in the past. 

Lenders use it to decide whether to approve your application and what interest rate to offer you. A higher score generally means better terms.

Different agencies hold slightly different data and use their own scoring model, so your score can vary between them. You are entitled to check your credit report, and doing so does not affect your score. 

Step 3: Compare your options

Before committing to a provider, compare cards based on what matters for your situation:

• Interest rate – especially important if you might carry a balance month to month;
• Fees – including annual fees, foreign transaction fees, and late payment charges;
• Rewards or cashback – relevant if you plan to pay off in full each month;
• Credit limit – some cards offer higher limits based on your profile.

It’s also worth exploring your options for introductory offers. For example, 0% purchase or balance transfer periods can offer real value if used correctly.

Step 4: Apply

Once you’ve chosen a card, you can apply online, through a bank branch, or in some cases by phone. 

You’ll typically need to provide:

• Full name and address history (usually the past three years);
• Date of birth;
• Employment status and employer details;
• Annual income;
• Monthly mortgage or rental payment.

Step 5: Wait for a decision

Many applications return an instant decision online. Others may take a few days, particularly if the lender needs to verify information. 

If approved, your card will usually arrive within five to seven working days.

If you’re declined, avoid applying to multiple providers in quick succession. Each application leaves a mark on your credit file, and several in a short period can signal financial difficulty to lenders and further reduce your chances.

Are Credit Cards Right for You? 

When used intelligently, credit cards are a useful financial tool. In most cases, credit cards are ideal for those looking to build or improve their credit score for future plans.

They’re also a great choice for people who pay their balance in full each month, therefore avoiding interest. In addition, they can be beneficial for those interested in rewards like cashback or travel perks. 

However, credit cards are usually not ideal for individuals who have a tendency to overspend or struggle to make payments on time. 

How Businesses Can Accept Credit Card Payments

Today, accepting credit card payments as a business is no longer optional – it’s a customer expectation you can’t afford to neglect. Whether you’re a physical store, an online shop, or offer services, giving customers flexible payment options will impact sales. 

Here’s what you’ll need to start.

• A merchant account – this is a type of business account that holds funds from card transactions before they’re transferred to your main bank account. Some providers bundle this into their service so you don’t have to set it up separately.
  
• A payment service provider (PSP) –  the company that processes the transactions on your behalf, handles security, and provides the hardware or software you need.
  
• Basic business documentation – most providers will ask for proof of identity, proof of business, and bank account details during onboarding.

If you sell face-to-face, whether in a shop, market stall, salon, restaurant, or at events, you’ll need a point-of-sale solution that can read physical cards and accept contactless payments.

myPOS offers a range of card terminals suited to different in-person setups. All myPOS terminals come with a built-in SIM and Wi-Fi connectivity, so they work anywhere without needing to be tethered to a separate internet connection

If you sell through a website or take payments remotely, you need an online payment gateway – the technology that securely captures and processes card details during checkout.

myPOS offers an online payment gateway that integrates with your existing website or e-commerce platform. It supports all major card types, 3D Secure authentication, and can be configured to match your site’s branding for a seamless checkout experience.

For businesses that invoice clients or take payments by phone, myPOS also provides payment links – a URL you send directly to a customer that takes them to a secure checkout page, no website integration required.

Frequently Asked Questions 

What income proof is typically required in a credit card application?

The majority of card issuers require basic income data, like payslips, bank statements, tax returns, or employment contracts.

What typically causes a credit card application to be declined?

A credit card application can be declined because of a low or no credit score, insufficient or unstable income, high existing debt, missed payments in your credit history, or errors in your application.

What are the real costs for a business to accept credit cards?

For businesses, the main cost when accepting credit cards is the transaction fee, which is usually a small percentage per payment. In some cases, businesses may also pay monthly service fees, terminal or setup costs, and additional charges for things like chargebacks or currency conversions.