What Is a “Hash” in Simple Terms within the Blockchain Context?

A hash is the output of a cryptographic hash function, a fixed-length string of letters and numbers generated from any input data. It acts as a unique digital fingerprint for that data.

Even a tiny change to the input data results in a completely different hash. In a blockchain, the hash of the previous block is included in the current block, creating an unbreakable, tamper-evident link that secures the entire chain.