Blockchain in simple words

A blockchain is a chain of linked blocks, and each block holds a set of data or transactions connected to what came before it.

Why it is used

It helps record information in a way that is hard to change later without leaving a trace, which makes it useful for documenting transfers and digital assets.

A practical example

When you send cryptocurrency, the transaction is recorded on the network according to its rules and can be verified without relying on a single closed ledger alone.