How Does Hashing Contribute to the Immutability of a Blockchain?

Hashing creates a unique, fixed-size digital fingerprint for each block's data. This hash is included in the next block, creating a chain.

If any data in a previous block is tampered with, its hash will change completely. This change invalidates the subsequent block's stored hash, immediately breaking the chain's integrity.

The need to re-mine all subsequent blocks makes alteration practically impossible.