Bitcoin (BTC)

Quick take

• Bitcoin is digital money that runs without a bank or government controlling it — just code and a global network of computers.
• There will only ever be 21 million bitcoins, ever. That hard cap is baked into the software and can’t be changed on a whim.
• Its price can swing hard and fast because it trades 24/7 worldwide and reacts to everything from big investor moves to breaking news.

What is Bitcoin?

Bitcoin is a form of digital cash that lives entirely online. There’s no physical coin, no central bank printing more of it, and no single company you can call if something goes wrong. Instead, it runs on a network of computers around the world that all follow the same set of rules.

It launched in 2009 as an experiment: what if money could move peer-to-peer, like sending a text, without needing a middleman to approve the transaction? Over a decade later, that experiment has grown into a trillion-dollar-plus asset that people use to send value, hold savings, or simply speculate on.

Right now there are just over 20 million bitcoins in circulation, out of a lifetime cap of 21 million. That scarcity is one of the things people point to when explaining why Bitcoin gets compared to digital gold.

How does Bitcoin actually work?

Every Bitcoin transaction gets bundled with others into a “block,” and that block gets added to a giant shared record called the blockchain. Think of it like a public receipt book that everyone can see, but no single person controls. Once a transaction is written in, it’s extremely hard to erase or fake.

Say you want to send a friend $50 worth of Bitcoin instead of using a bank transfer. You’d send it from your digital wallet straight to theirs. Computers on the network (called miners) check that you actually own that Bitcoin and haven’t already spent it elsewhere, then lock the transaction into the next block. No bank hours, no approval process — just the network doing its job.

Miners get paid in freshly created Bitcoin for doing this work, but that reward shrinks by half roughly every four years in an event called the “halving.” That’s part of how the total supply gets capped at 21 million over time.

What moves the BTC price?

Like any asset, Bitcoin’s price comes down to supply and demand — but the details are unique. On the supply side, new Bitcoin enters circulation at a fixed, shrinking rate thanks to the halving schedule, and the total will eventually stop growing entirely once all 21 million are mined.

On the demand side, prices react to who’s buying and why: everyday investors, large institutions, and even countries adding Bitcoin to their holdings can all shift demand quickly. News about regulation, big exchange hacks or collapses, new investment products like ETFs, and macro events like interest rate changes or inflation worries also ripple through the market fast.

Because Bitcoin trades non-stop, worldwide, sentiment can flip in hours rather than days. That’s why you’ll see sharp rallies and sharp pullbacks — both are just part of how this market has always behaved.

Bitcoin FAQ

Is Bitcoin the same as blockchain?

No. Blockchain is the underlying technology — the shared record-keeping system. Bitcoin is one specific application of that technology, used as digital money. Plenty of other projects use blockchain tech for completely different purposes.

Can Bitcoin be hacked?

The Bitcoin network itself has never been hacked in the way people imagine — its core code and blockchain have proven remarkably resilient since 2009. Losses usually happen at the edges, like exchanges or wallets with weak security, not the network itself.

Why is there a 21 million limit?

Bitcoin’s creator built the cap directly into the software to mimic scarce resources like gold. It’s enforced automatically by the network’s rules — no committee votes on it, and changing it would require the entire global network to agree, which is essentially unthinkable at this point.

This guide is for general information only and isn’t financial advice. Crypto markets are volatile — always do your own research before making decisions.