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 intended use.

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 extension is a …

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.

FILE EXTENSION definition: 1. a dot followed by three letters, such as .doc or .jpg, that forms the end of the name of a…. Learn more.

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 period.

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 organized. A …

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 after the …

This guide covers the basics of file extensions, including their purpose, common types like images, documents, and videos, and how to recognize them in various contexts.

Nov 5, 2012 · A file extension (or simply "extension") is the suffix at the end of a filename that indicates what type of file it is. For example, in the filename "myreport.txt," the .TXT is the file extension.

File Extension: This is a brief string added to the file name, helping identify the file type and the software that can open it. For instance, a file named "document.docx" has the ".docx" extension, indicating it's …