Bitcoin transactions are verified by a network of computers around the world, and recorded on a public ledger called the blockchain. This means that transactions are transparent and cannot be altered or reversed once they are recorded on the blockchain.

Bitcoin is often referred to as a cryptocurrency because it uses encryption techniques to regulate the generation of units of currency and verify the transfer of funds. Bitcoin can be bought and sold on cryptocurrency exchanges, and can also be used to purchase goods and services from merchants who accept Bitcoin as a form of payment.

Bitcoin has gained popularity in recent years as an alternative investment and a way to store value, but it is also subject to significant volatility and regulatory risks. It's important to carefully consider the risks and potential rewards before investing in Bitcoin or any other cryptocurrency.