An operating system recognizes many kind of file format. All the file formats are identified with the file extension. Every file name contains file name and its extension separated by the “.”(dot) symbol . The file extension is created by one or more letters.
Just looking at the extension, you can know the file information such as, what program it is, and how to open it. For example ‘.psd’(Photoshop Document) format stores an image with layers and other features available in Photoshop, it will open with only Adobe Photoshop, Like wise file extension part plays a vital role in the efficient functioning of file.
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