What is a block in a cryptocurrency blockchain?

A block in a cryptocurrency blockchain is the basic unit of data storage that contains user transactions. Each block consists of a set of operations that are confirmed and secured using cryptography. This data is arranged into a chain, starting from the first block and continuing to the most recent one. Each new block is linked to the previous one using a unique hash code, thereby creating an uninterrupted chain that cannot be altered. Such a blockchain structure ensures transparency and security, eliminating the possibility of tampering with transaction history.