A Subfolder. Folder-ception
A folder contained within another folder. Example: Having a music folder. And the other folders inside the music folder are seperated for their different genres. R&B, rap, rock, etc.
dylib files can be found in the Lib folder or contained within an application's package.
nested
sub folder.
One example of a landlocked country entirely contained within another country is Lesotho, which is entirely surrounded by South Africa. Its territory is landlocked within South Africa's borders.
Mods are usually contained within a .pk3 file. This file should not be expanded, but placed into your base Jedi Knight II/Gamedata/Base folder. If the file is not a .pk3 file, but a folder containing other files, then this folder should be placed in your Jedi Knight II/Gamedata folder, but the Base folder.
Lesotho is a country that is entirely contained within South Africa. It is an enclaved country, meaning it is surrounded entirely by the territory of another country.
inclusions
DO NOT TOUCH THE FOLDER! It will break it nearly as much as deleting the system32 will!
The GAME folder within the PSP folder.
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.....