In computer terms, with root we can mean:

• Root as user
• Root as in file path

If we mean root as an user, we mean the main user, the one with the “master” control of the machine. For example, if you have root on Android, it means you can do whatever you want it it.

If you mean root as a file path, it’s the base, just place the file outside any folder. If you’re using the D: drive, by saying “place the file in root”, it means just place it on D: