A filename extension, file name extension or file extension is a suffix to the name of a computer file (for example, .txt, .mp3, .exe) that indicates a characteristic of the file contents or its …

Jul 17, 2023 · A file extension or suffix is the group of characters, usually 3-4 in length, after the period in a full file name. Also called a filename extension.

Dec 16, 2025 · A file extension is the ending part of a computer file's name. Regardless of whether your job directly requires IT-related knowledge and skills, learning about file …

Nov 27, 2025 · A file extension is a suffix attached to the end of a file name that indicates the file type or format. This often consists of a period followed by a series of letters and is used by …

Jun 11, 2025 · File extensions are suffixes added to file names that indicate the file format and type of data, assisting in file recognition and compatibility.

May 15, 2023 · What is a file extension (file format)? In computing, a file extension is a suffix added to the name of a file to indicate the file's layout, in terms of how the data within the file is …

Sep 7, 2025 · A file extension or file name extension is the ending of a file that helps identify the file type in operating systems such as Microsoft Windows. In Microsoft Windows, the file name …

Your computer has many different types of files on it, and each one has its own file extension. A file extension is a three- or four-letter identifier found at the end of a file name and following a …

What is a File Extension? A file extension is a three or four-letter code that appears at the end of a filename and indicates the type of file it is. For example, .txt stands for text files, .jpg stands for …

Sep 25, 2023 · Learn about what a file extension is in this article. A file extension, also known as a file suffix, or a filename extension, is an ending of a file used to identify the file type. It comes …