A file extension tells you the type of file you are looking at. For example: .exe is an executable file or application program, and a .mp4 is a type of video file

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File Extensions

Picture files have several different types of compression, which means they have different extensions

​Picture Files

Examples of Image file extensions are:

.PNG - Portable Network Graphics

.JPG/JPEG - Joint Photographic Experts Group

.BMP - Bitmap Image File

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Picture File Extensions

.GIF - Graphical Interchange Format

This is a set of images that cycle giving the appearance of movement

​Special Picture Extensions

Video files contain images and audio within the same file which typically means they are larger types of files. The two most common types are:

.MP4

.MOV

​Video Extensions

Audio files also have unique file format and extensions, the two most common file extensions:

.MP3

.WAV

AudioFile Extensions

Documents are one of the most use file types for school. Examples of common document files are:

.DOC

.DOCX

.PDF

Document File Extensions

Another type of commonly used files is a sideshow presentation. The most common file extension is:

.PPT or .PPTX

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Slideshows File Extensions

Spreadsheets have the largest number of type of file extensions, but we will only look at 3 of the most commonly used:

.XLS or .XLSX

.CSV

.TXT

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Spreadsheet Extensions

Online programs like Google Docs, Slides, or Sheets do not actively contain a file extension because it is an online and does not save to your files like offline applications do

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Online Applications Extensions