File extension

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A file extension usually defines the file format of a file. It is the final part of a filename, following the dot in the name of file. For example, in "index.html", the file extension is "html" (or more frequently ".html").

The main advantage of a file extension is that it defines the type of the file, "doc" for document, "txt" for text file, "html" for a web page, "exe" for an executable, and so on. File extensions enable the recognizing of the type of a file for both humans and computers.

For humans, you can know what each file does, for example, a file with the .exe extension is an executable, and therefore it is usually the main file in a program or game which executes all of the code.

[edit] See Also

• File format
• File path
• File name