What is blockchain and how does it work with cryptocurrency?

Blockchain is a distributed database that allows storing information about transactions in a chain of blocks. Each block contains data about transfers that, once confirmed, cannot be changed. This ensures the security and transparency of processes, which is especially important in cryptocurrencies. When a user sends cryptocurrency, the transaction is recorded in the blockchain, and it cannot be forged due to the use of cryptography. An important aspect is decentralization, where there is no single governing body, and the network is maintained by numerous participants around the world.