in easy words: what is a blockchain?

A blockchain is a type of computer file that stores information such as transactions. files, so that they are very difficult to modify or counterfeit.

Instead of being controlled by a central authority, a blockchain is managed by many computers on a network. Each computer on the network has a copy of the record, and any new information added must be approved by most of the computers on the network before it is added to the record.

This makes the information in the blockchain very secure and trustworthy, as it cannot be tampered with without the entire network noticing. Blockchain technology is often used with cryptocurrencies such as bitcoin, but it can also be used in other areas such as logistics or healthcare.