FYI is a common abbreviation of "for your information".
"FYI" is commonly used in e-mail, instant messaging or memo messages, typically in the message subject, to flag the message as an informational message, with the intent to communicate to the receiver that he/she may be interested in the topic, but is not required to perform any action. It is also commonly used in informal and business spoken conversations.
The usage of "FYI" goes back at least as far as 1959, where a character uses it in season 1, episode 2 of "The Twilight Zone."
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 the way" to answers to commonly asked operational questions.
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