A laptop is smaller than a PC and is portable, which means it can be carried around. It is powered by batteries or the mains and is usually very light and very thin – less than three inches in thickness. Many manufacturers make laptops, including IBM, Apple, Compaq, Dell, and Toshiba.
Many manufacturers make PCs, including IBM, Apple, Compaq, Dell, and Toshiba.
A PDA is (Personal Digital Assistant) a lightweight consumer electronic device that looks like a hand-held computer but instead performs specific tasks; it can serve as a diary or a personal database or a telephone or an alarm clock.