When you open that file in Windows, for example, the operating system looks for whatever app is associated with JPG files, opens that app, and loads the file. For example, a file named “awesome_picture.jpg” has the “jpg” file extension. If you’ve ever opened a document or viewed a picture, you’ve probably noticed these letters at the end of your file.įile extensions are used by the operating system to identify what apps are associated with what file types-in other words, what app opens when you double-click the file. It comes after the period and is usually two to four characters long. A file extension, or filename extension, is a suffix at the end of a computer file.
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