R.F.C. stands for "Request for Comments," a series of documents used to develop and share information about the internet and related technologies. These documents cover a wide range of topics, including protocols, procedures, and best practices. They are published by the Internet Engineering Task Force (IETF) and serve as a way for experts to propose ideas and gather feedback from the community. Each R.F.C. is assigned a unique number and can be updated or replaced by newer versions. Some R.F.C.s become standards, while others remain informational. They play a crucial role in the evolution of the internet and help ensure consistency and interoperability among different systems and technologies.