Laptops are portable & have the same features as desktops in small, all-in-one packages. A laptop can run on batteries & is ideal for travel, small businesses & students heading to school.
Desktops have been around the longest. The prices are as far-reaching as the specs, but for the most bang for the buck, desktops win. The one major drawback is the space they take up.
Looking for a simple machine with good battery life for basic computing like email, surfing the web, spreadsheets & word processing? Try a netbook (please note there's no CD-ROM drive).
Tablets are handheld, highly portable devices that allow you to surf the net, e-mail, view photos/videos, read ebooks, play music/games & more. The on-screen keyboard isn’t ideal for typing quickly, or for too long.