A Request for Comments (RFC) is a formal document from the Internet Engineering Task Force ( IETF ) that is the result of committee drafting and subsequent review by interested parties. Some RFCs are informational in nature. Of those that are intended to become Internet standards, the final version of the RFC becomes the standard and no further comments or changes are permitted. Change can occur, however, through subsequent RFCs that supersede or elaborate on all or parts of previous RFCs.
Ex. You want to know detail info about “UDP”, the request for comment of UDP is RFC 768.
Go to the website: http://www.ietf.org/rfc.html