Bitcoin (BTC) is the first widely adopted cryptocurrency. It was designed to let people send value over the internet without needing a bank, payment company, or central authority to approve each transaction.
How Bitcoin works
Bitcoin transactions are recorded on a public blockchain. Computers on the network check transactions, group them into blocks, and protect the history with hashing and proof-of-work mining.
Why Bitcoin matters
Bitcoin introduced digital scarcity. There can only be 21 million BTC, and new coins are issued through mining on a predictable schedule. This makes Bitcoin different from regular money, which can be created by central banks.
People use Bitcoin as a payment method, a long-term digital asset, and a way to hold value outside traditional banking systems. It is also volatile, so understanding wallets, private keys, and market risk is important before using it.