Block height is defined as the number of blocks in the chain between any given block and the very first block in the blockchain.
Blockchain is revolutionary technology for creating permanent, secure digital recordings. It can record any information, but it started with recording bitcoin transactions.
Imagine the blockchain as a book of records where each page in that book is what is known as a “block”. Blocks are attached to each other making what is known as the “chain”. The first block in a blockchain is known as the genesis block.