Components of a Blockchain

Two main parts make up a blockchain. The first component is
the decentralized network
The decentralized network is what facilitates and verifies the transactions that are made.
Having blockchains on a decentralized network means that the software isn't limited to one computer system. Instead, it can be controlled on multiple computer systems, and more importantly, it isn't controlled by the government.

The second component is
the indisputable ledger
where the transactions are processed and recorded in a location that is secure. This security makes it almost impossible for someone who is not connected to the chain to make changes or steal information.