A **zk proof**, short for **zero-knowledge proof**, is a cryptographic method that allows one party (the prover) to convince another party (the verifier) that a specific statement is true **without revealing any additional information** beyond the fact that the statement is indeed true.

In other words, zk proofs enable verification of correctness without disclosure of the underlying data. This concept is fundamental in privacy-focused technologies, blockchain systems, and digital identity verification—where it can, for example, prove ownership or validity without exposing sensitive details.