Blockchain is a distributed digital ledger technology that is used to store and record data. It is composed of a chain of blocks, which are linked together and secured by cryptography. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data, among other information. Blockchain is often compared to a digital spreadsheet, since it stores and records data in a secure and transparent way. This makes it an ideal technology for tracking and verifying transactions, contracts, and identities. It is also beneficial for its decentralized nature, which eliminates the need for a third-party intermediary in transactions. One example of a blockchain application is Bitcoin, a digital currency that is built on the blockchain. Blockchain technology is also being used in a variety of industries, such as healthcare and finance. Fun Fact: Blockchain was first introduced in 2008 in a white paper written by an anonymous individual or group of individuals known as Satoshi Nakamoto.