Block height refers to the number of blocks that have been added to a blockchain since its inception. It provides a way to measure the length of the chain and indicates how many blocks exist up to a specific point in time. Each block contains transaction data and is linked to the previous block, forming a chain.

The height increases by one with each new block added. For example, if the first block created is considered block height 0, the next block will be height 1, and so on. Block height is important for various reasons. It helps users identify the order of transactions and ensures the integrity of the blockchain.

It is also used in consensus mechanisms where nodes need to agree on the current state of the ledger. Additionally, certain protocols and applications may utilize block height to trigger events, such as token releases or updates in network rules. Thus, it serves as a crucial metric for monitoring and interacting with the blockchain.