Files, Folders and Defrag – Help Organise Your PC

What is a file?

A file on your computer is much like a file that you would keep in your filing cabinet. Each file has a unique name and is kept in a specific location. Each computer file has a three character extension which is separated from the file name by a period. The extension is often hidden however there is an option in Windows to display this if you wish. The extension relates to a specific program. This tells the computer which program to open it with. For example, a file extension xls or xlsx relates to Microsoft Excel.

Some file extensions, such as .mp3 can be opened in a variety of programs.

What is a Folder?

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