A file extension is a three- or four-letter sequence, preceded by a period, that identifies the file as a particular type of document.

Question

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File extensions, which follow a period at the end of a file name, indicate the file format or type, helping the operating system to recognize and select appropriate software to open it. They can be three, four, or more characters long, such as .txt, .jpeg, or .html.

A File Extension Is a Three- or Four-Letter Sequence, Preceded