A folder is the top level location files can be located in. A sub-folder is a folder under the parent folder. Folders and sub-folders make managing and organizing files easier.
In most file systems nothing, except its location in the hierarchy of folders.
C:\ is the root directory C:\folder\ is sub directory
expand is (+)sign means that the folder have sub folders but not display. if you click the (+)sign the sub folders will display, and the sign will change to (-). collapse is (-) sign mens that sub folder are display. if you click the sign (-) the folders will disappear and the sign will change to (+).
The sub folder is a folder inside the file folder. For example... The "Sample Pictures" folder is a sub folder to the "My Pictures" folder. It's pretty straight forward and simple...so hope that helps?
A sub folder is when you put a folder in another folder and a sub level folder is when you put more than one sub folder in another sub folder.....
You can make about 5 sub-sub folders in another folder.
what is the differences between a file and a folder
sub folder.
There are a number of ways. Probably the simplest is to open a folder window (My Computer or Windows Explorer) for the folder in which you want to create a sub-folder. Right click in a blank area of the file list pane, and move the mouse to New. Select Folder in the sub-menu. A sub-folder called New Folder, with the name highlighted (selected), will be created. Type the name you want for your sub-folder, then press Enter. This will replace New Folder as the name of the sub-folder.
explain the difference between systems and sub systems
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Yes. The one inside is called a sub-folder.