A file extension is a tag of three or four letters,preceded by a period,that identifies a data file's format or the application used to create the file.

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This is correct. A file extension is typically composed of three or four letters and is preceded by a period. It is used to identify the format of a data file or the application used to create the file. Some common examples of file extensions include .docx for Microsoft Word documents, .pdf for Adobe Acrobat files, and .jpg for image files.

A File Extension Is a Tag of Three or Four