What Is a Genesis Block?
The genesis block is the first block created in a blockchain. It is the starting point, or foundation, of the entire blockchain network. Unlike ordinary blocks, the genesis block does not depend on an earlier blockchain block because no previous block exists when the blockchain begins.
A blockchain normally consists of a sequence of blocks connected through cryptographic hashes. Each new block refers to the hash of the block before it. The genesis block is the exception because it is the first block in that sequence.
Simple Definition:
The genesis block is the first block of a blockchain from which the chain begins and subsequent blocks are linked.
