Every day, we come across different types of file extensions while working on a computer. The file extensions tell an operating system about the type of file so that the OS could select the right app or software to display the information in that file. The file extensions are written at the end of a file name after a dot (.). For example, a PDF file has a .pdf extension, a text file has a .txt file extension, etc.
You can view the file extension by changing the View mode in the File Explorer or by viewing the file properties. But sometimes, the file properties window shows you nothing. This usually happens when the file has no extension. You can create files with no extension on your Windows computer.
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