A Blockchain is a distributed, expandable computing architecture on the Internet, where records of assets or exchange are stored. It combines the BitTorrent protocol, which allows peer-to-peer networking, and public-key cryptography.
Examples: Bitcoin, Bitlite, Ethereum
How does a Blockchain work? Click here for a simple explanation.
What is the current state of Blockchain technology? Click here for the 2018 State of Blockchain.