Best current practice
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A best current practice (BCP) is a de facto level of performance in engineering and information technology. It is more flexible than a standard, since techniques and tools are continually evolving.
The Internet Engineering Task Force publishes best current practice (BCP) documents in a numbered document series. Each document in this series is paired with a request for comments (RFC) document. BCPs are document guidelines, processes, methods, and other matters not suitable for standardization. The Internet standards process itself is defined in a series of BCPs, as is the formal organizational structure of the IETF, Internet Engineering Steering Group, Internet Architecture Board, and other groups involved in that process. IETF's separate STD document series defines the fully standardized network protocols of the Internet, such as IP, TCP, and DNS.)
A given RFC number always refers to a specific version of a document but the BCP number refers to the most recent revision of the document. Thus, citations often reference both the BCP number and the RFC number.