Blockchain is a public register in which transactions between multiple users belonging to the same network are stored in a secure, verifiable and permanent way. The data relating to the exchanges are saved inside cryptographic blocks, connected in a hierarchical manner to each other. This creates an endless chain of data blocks -- hence the name blockchain -- that allows you to trace and verify all the transactions you have ever made. Blockchain has a technical infrastructure and functionality that is able to guarantee a high level of security, stability, and scalability. This block of chains characterizes Bitcoin and have actually enabled its value to skyrocket. See Ref.
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What Is A BlockChain And What Is It For?
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