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.

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 …

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 …

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 …

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 three- or four-letter identifier found at the end of a file name and following a period. These extensions tell you about the characteristics of a file and its use.

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 …

Jul 31, 2025 · What Is a File Extension? A file extension is a suffix at the end of a file name, typically made up of three or four letters, separated by a period (dot). Think of it like a label that...

Jun 11, 2025 · File extensions are the suffixes added to the end of file names, typically consisting of three or four characters preceded by a dot. Their primary function is to indicate the file …

Nov 5, 2012 · File Extension Definition - What is a file extension? A file extension (or simply "extension") is the suffix at the end of a filename that indicates what type of file it is. For …