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.

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 …

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.

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 operating …

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 extension.

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.

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 example, in the filename …

Jun 6, 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 extensions can help you gain …

What is a File Extension? A file extension is a group of letters that come after a file name, usually separated by a dot (.). It helps the computer understand what kind of file it is and what program can …