A file extension is always the same as a file format.

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Quizplus · Accepted Answer

A file extension is a set of characters that come after the period in a file name and indicates the type of file. A file format, on the other hand, refers to the way the data is structured and organized within the file. While the file extension often corresponds to a particular file format, this is not always the case. For example, a file with a .docx extension may contain data in the Word format, but it could also be a ZIP file that contains other types of files.

A File Extension Is Always the Same as a File