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, sometimes called a file suffix or a filename extension, is the character or group of characters after the period that makes up an entire 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 …

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 …

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 …

A file extension is a suffix added to a filename that typically follows a period (dot) and is used to identify the file type. For instance, in the filename "document.docx," ".docx" serves as the 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 …