Here Is the Answer:
The file extension identifies the type of file and helps the operating system associate the correct program with it. For example, a file with a docx extension is associated with Microsoft Word and a file with a jpg extension is associated with an image viewer. File extensions also help users easily recognize the type of file they are dealing with. It is important to note that changing a file extension does not necessarily change the file type, but it can cause errors if the new extension is not compatible with the file's content.