The Noise Protocol is a modular framework for building cryptographic communication protocols. It allows developers to design secure channels by combining different cryptographic primitives, such as key exchange, encryption, and authentication, in a flexible and auditable way. Noise Protocol patterns specify how parties exchange messages to establish shared secrets and protect data integrity and confidentiality. Widely used in modern secure messaging and VPN tools, Noise is valued for its simplicity, security proofs, and adaptability to various use cases. Its open design and formal analysis make it a popular choice for implementing custom secure communication protocols.