Blockchain is a distributed ledger system in which a series of linked blocks are securely linked together using cryptographic methods. Each block contains the data of the previous block, and thanks to these connections, a chain of trust is created between blocks.

Blockchain is used to store and transfer data in a decentralized and reliable way. It is a technology that forms the basic infrastructure of cryptocurrencies (for example, Bitcoin and Ethereum). It can also be used as a platform to support automated transactions such as smart contracts.