Blockchain is a distributed ledger technology that allows transactions to be recorded in a secure, transparent, and immutable way. Also known as a chain of blocks, it consists of a series of blocks that contain information about transactions, linked together using cryptography.
Imagine a public ledger, but instead of being in one place (like a bank), it is distributed across many computers (the network). Each block in the chain contains information about a group of transactions, and these transactions are validated by all participants in the network. Once a block is added to the chain, it cannot be changed or deleted, making it a secure and transparent record of transactions.