The abbreviation "FYI" stands for "for your information." It is commonly used in both written and spoken communication to introduce information that may be relevant or useful to the recipient. It's often utilized in emails, memos, and notes to alert someone to important content without necessarily requiring a response.
"FYI" originated as an acronym in the mid-20th century, often used in business and professional communication. Its first known printed use was in the 1960s, and it quickly gained popularity in informal and formal contexts.