A Zero-Knowledge Proof is a method used in cryptography that allows one party, the prover, to demonstrate knowledge of a secret to another party, the verifier, without revealing the secret itself. This technique ensures that the verifier can be confident the prover knows the information, while the actual details remain hidden. These proofs are useful in various applications, such as secure authentication and blockchain technology. By using Zero-Knowledge Proofs, systems can enhance privacy and security, allowing users to prove their identity or ownership of data without exposing sensitive information.