What you understand by file extension??
Answers
Understanding file extensions
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. These extensions tell you about the characteristics of a file and its use. In this lesson, we'll go over some examples of these extensions, as well as how to determine a particular file's extension.
Examples of file extensions
A JPEG uses the .jpg or .jpeg extension (for example, image.jpg).
A Word document uses the .docx extension, or .doc for older versions (for example, CoverLetter.docx).
An MP3 audio file uses the .mp3 extension (for example, rhyme_rap.mp3).
An Excel spreadsheet uses the .xlsx extension, or .xls for older versions (for example, budget.xls).