What is file name extention ?

A file name extension is a suffix added to the end of a file name to indicate the type of file it is or the format it is saved in. It typically consists of a period followed by a few letters or numbers. For example, in the file name "document.docx", the ".docx" is the file name extension, indicating that it is a Microsoft Word document saved in the DOCX format. File name extensions help operating systems and software programs identify and handle files correctly.

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