When I started out using computers, an adult explained it to me using a shelf as a metaphor: The drive is a shelf. You can have multiple shelves. Shelves have c

When I started out using computers, an adult explained it to me using a shelf as a metaphor: The drive is a shelf. You can have multiple shelves. Shelves have compartments, which contain things. Some of those things can contain other things, like boxes or folders. Made the nesting rather obvious to me.