What is the Blockchain?

A person could think of the blockchain as a type of open ledger, a ledger in digital form. Each time a new transaction is added, a record is kept and shared to each connection on the blockchain. This setup makes it difficult or even impossible to hack, cheat or even change the system. Each block contains a series of transactions. And each time a new transaction happens on the blockchain, a record or a copy is added to the ledger of each connection within the system.