What is cryptocurrency? A plain-English guide

Cryptocurrency has been impossible to ignore for the past few years. Whether it's Bitcoin hitting new price records, a friend telling you they made a fortune, or headlines about people losing their savings — it's constantly in the news.

But what actually is it? How does something with no physical form and no government backing become worth tens of thousands of pounds? And why does the price swing so wildly?

This guide answers those questions in plain English. No jargon. No charts you need a finance degree to read.

So what is cryptocurrency?

Cryptocurrency is digital money — tokens that exist only as data on a computer network. There's no coin in your hand, no note in your wallet, no bank holding it for you. It exists purely as a record saying "this person owns X amount."

The most famous is Bitcoin, created in 2009. Since then thousands of others have been created — Ethereum, Solana, Dogecoin, and many more. Each is its own separate thing with its own rules, though they share the same basic idea.

What makes crypto different from normal digital money (like the number in your bank app) is that it isn't controlled by any single organisation — no bank, no government, no company. Instead it's maintained by a network of computers all over the world.

What is a blockchain?

You'll hear the word "blockchain" constantly when people talk about crypto. It sounds technical, but the idea is straightforward.

Imagine a spreadsheet that records every transaction ever made — who sent what to whom. Now imagine that spreadsheet isn't stored in one place, but copied identically across thousands of computers worldwide. Every time someone makes a transaction, all those computers check it, agree it's valid, and add it to the spreadsheet at the same time.

That shared, agreed-upon record is the blockchain. Because no single person or company controls it, nobody can secretly alter a transaction or create coins out of thin air. The computers in the network would immediately reject it.

It's a clever system — but it's worth noting that "clever technology" doesn't automatically mean "safe investment."

Where does crypto actually come from?

New Bitcoin (and some other currencies) are created through a process called mining. Computers compete to solve complex mathematical puzzles — the winner gets a small reward in new Bitcoin. This is how new coins enter circulation.

Crucially, Bitcoin has a hard limit: there will only ever be 21 million Bitcoin in existence. That's built into the code from day one and can't be changed. When they're all mined, no more can be created. This scarcity is a central part of why Bitcoin holders believe it will hold or increase its value over time — like gold, there's a finite supply.

Other cryptocurrencies work differently. Some have no hard cap. Some were created all at once and distributed. The rules vary widely between currencies.

Why does the price go up?

This is the question everyone wants answered, and the honest answer is: mostly because people believe it will go up.

Crypto prices are driven by supply and demand like anything else. But unlike a company's shares (which are backed by actual business revenue and assets), or a house (which has physical utility), most crypto has no underlying earnings or use that justifies a specific price. Its value comes largely from what people collectively believe it's worth.

Here are the real forces that push prices upward:

• Scarcity: Bitcoin's fixed supply means that if demand increases, the price must go up — there's no way to make more of it to meet that demand.
• Media attention and hype: When Bitcoin appears in headlines, more people buy it. More buyers → price rises. Rising price → more headlines. It's a feedback loop.
• Big money entering the market: When large investment funds or corporations start buying, it pushes prices significantly. The announcement alone can move markets.
• Expectations of wider use: If people believe crypto will eventually replace traditional banking or be widely accepted as payment, they buy now hoping to benefit later.
• Fear of missing out (FOMO): When friends or social media contacts claim to have made money, others pile in. This drives rapid price rises — and equally rapid crashes when sentiment reverses.

And why does the price crash?

For the exact same reasons, in reverse. Negative news (regulation, exchange failures, hacks), loss of confidence, or simply large holders selling can trigger rapid falls. In 2022, Bitcoin lost roughly 75% of its value in less than a year. People who'd bought near the peak lost three-quarters of their money.

Unlike a bank account, there is no deposit protection for crypto. Unlike company shares, there is no underlying business that might recover. If the price falls and stays low, there is nothing underneath it.

Why we don't recommend it

Here's what makes crypto genuinely different from other financial decisions:

• You can lose everything, fast. Not "you might lose some" — you can wake up and find your holding worth 80% less than yesterday.
• It's not regulated like a bank. Banks in the UK, US, Australia, Canada, and Ireland are required to hold your money safely. Crypto exchanges are not held to the same standards.
• Scams are everywhere. Crypto is the number one vehicle for financial fraud globally. Celebrity endorsements, "guaranteed returns," and too-good-to-be-true schemes are almost always fraud.
• The price is driven by sentiment, not fundamentals. There's no reliable way to calculate what Bitcoin "should" be worth, because it has no earnings, no dividends, and no physical asset backing it.

If you're curious anyway

Some people do buy crypto with money they can genuinely afford to lose — treating it more like a lottery ticket than a savings plan. That is a personal choice. But the key phrase is money you can afford to lose entirely.

Never use emergency savings. Never borrow to buy. Never put in money you'd need in the next few years. And treat any forum, social media post, or friend who says "you can't lose" as a very clear warning sign.

The bottom line

Cryptocurrency is a genuinely interesting technology. The blockchain is a real innovation. But interesting technology and safe investment are two very different things — and for most people focused on day-to-day budgeting, there are far better places to put spare money: paying off high-interest debt, building an emergency fund, or a standard savings account.

If you want to understand how to grow your money steadily and safely, you're in the right place.