FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -A file extension or file name extension is the ending of a file that helps identify the type of file in operating systems, such as Microsoft Windows. In Microsoft Windows, the file name extension is a period that is often followed by three characters but may also be one, two, or four characters long.

Detailed explanation-2: -The extension is a three-or four-letter abbreviation that signifies the file type. For example, in letter. docx the filename is letter and the extension is docx. Extensions are important because they tell your computer what icon to use for the file, and what application can open the file.

Detailed explanation-3: -Extensions tell your computer which application created or can open the file and which icon to use for the file. For example, the docx extension tells your computer that Microsoft Word can open the file and to display a Word icon when you view it in File Explorer.

Detailed explanation-4: -The three letter extension is one way Windows at times (but not always) keeps track of what a file is supposed to be. For example, files containing ordinary text usually have a three letter extension of . txt and Microsoft PowerPoint presentations usually have a three letter extension of . ppt.