>"I know they are tools of the outside world used to share information across great distances, and little more than that."
>The apron-wearing fanboy nods slowly, looking somewhat concerned.
>"I... guess I'll have to start at the beginning, then."
>"Computers are information-processing machines from the outer world that are used... well, all over the place, by now. They started out as convenient ways to do arithmetic automatically, but things took off from there. Now they can do a bunch of things, like store a whole bunch of data, search for stuff in that data, communicate with other computers, display images, play sounds, let you make stuff on the computer, or play games, or stuff like that. They're pretty flexible."
>"Hard drives are what computers use to store data, so you can have more stuff on the computer to use. Megabytes are... a measurement of size for that, which isn't too terrible, but about a thousandth of what the outer world is usually using at this point."