In Blockchain, each block contains, but not limited to, a cryptographic hash of the previous block along with the transaction data. It can be used by two parties to record transactions in a secure and permanent way. It is managed by a peer-to-peer network and allows the safe transit of digital information.
Blockchain technology was originally designed to deal with Bitcoin but now it has become the talk of the town, a revolution. During its earlier stage, the technology confronted heavy criticism and rejection but after a thoughtful revision, it came out to be more productive, more useful, and more secure. It has now become a practical way to store data in a digital form that is reconciled from time to time.