A blockchain is a type of database that is used to store data in a way that is secure, transparent, and difficult to tamper with.

It is a decentralized system, meaning that it is not controlled by any single person or organization. Instead, it is maintained by a network of computers that work together to validate and record transactions on the network.

Each transaction is recorded as a “block” of data, and once it is added to the blockchain, it cannot be altered or deleted.

This makes the blockchain a tamper-evident and immutable record of all the transactions that have occurred on the network.