FYI is a common abbreviation of For Your Information.

• FYI is also commonly used in email or memo messages, typically as the first thing on the subject line, to flag the message as an informational message to be used only as reference material.

• On the Internet, FYIs are a subset of the RFC series.

The following description is taken from FYI 1, the FYI on FYIs:

The FYI series of notes is designed to provide Internet users with a central repository of information about any topics which relate to the Internet. FYIs topics may range from historical memos on "Why it was done this way" to answers to commonly asked operational questions.

See also: Request for Comments, Internet standard, BCP, FAQ, Internet_slang

• FYI was also the name of a fictional newsmagazine on the television series Murphy Brown.