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  1. What Is a File Extension & Why Are They Important? - Lifewire

    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.

  2. What Is a File Extension? - Computer Hope

    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 …

  3. File Formats with Types and Extensions - GeeksforGeeks

    Jul 27, 2025 · A file format is a standard way of storing data in a computer file. There are multiple types of file formats present which can be used to store and retrieve data efficiently.

  4. What is a file extension (file format)? | Definition from TechTarget

    May 15, 2023 · A file extension comes after the period in a filename and is typically made up of three or four alphanumeric characters that identify the file's format. For example, in a file …

  5. What Is a File Extension? File Extension Examples - iBoysoft

    Aug 5, 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 …

  6. Basic Computer Skills: Understanding File Extensions

    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.

  7. What Is A File Extension? - How-To Geek

    Sep 27, 2021 · A file extension, or filename extension, is a suffix at the end of a computer file. It comes after the period and is usually two to four characters long. If you've ever opened a …

  8. What is the difference between a file extension and a file type?

    Sep 11, 2024 · What is the difference between a file extension and a file type? In simple terms, a file extension is a label used to identify a file type, while the file type refers to the type of data a …

  9. What Is a File Extension? A Definitive Guide (Plus Examples)

    Jun 6, 2025 · What is a file extension? A file extension is the suffix of a computer file that an operating system uses to identify the exact file type. When executing the respective file, the …

  10. File Extension: What is a File Extension? - Lenovo

    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 …