In computer network engineering, a Request for Comments (RFC) is a memorandum published by the Internet Engineering Task Force (IETF) describing methods, behaviors, research, or innovations applicable to the working of the Internet and Internet-connected systems.
Through the Internet Society, engineers and computer scientists may publish discourse in the form of an RFC, either for peer review or simply to convey new concepts, information, or (occasionally) engineering humor. The IETF adopts some of the proposals published as RFCs as Internet standards.
Request For Comments documents were invented by Steve Crocker in 1969 to help record unofficial notes on the development of the ARPANET. They have since become the official record for Internet specifications, protocols, procedures, and events.
RFC are available at - https://www.ietf.org/rfc.html