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?
A folder usually contains a collection of files similar to a folder in a filling cabinet. You can have folders within a folder. These are known as subfolders. You may sometimes hear folders referred to as directories.