A Zero-Knowledge Proof is a method used in cryptography that allows one party, known as the prover, to demonstrate knowledge of a specific piece of information to another party, called the verifier, without revealing the actual information itself. This technique ensures that the verifier can be confident the prover knows the information, while the details remain secret. This concept is particularly useful in enhancing privacy and security in digital communications. For example, it can be applied in blockchain technology to verify transactions without disclosing sensitive data, thereby protecting user identities and maintaining confidentiality.