There are
different types of computer. The (largest) and (most powerful) are mainframe
computers. Minicomputers are (smaller) than mainframes but are still very
powerful. Microcomputers are small enough to sit on a desk. They are the
(most common/the commonest) type of computer. They are usually (more powerful) than
minicomputers.
Portable computers are (smaller) than desktops. The
(largest) portable is a laptop. (Smaller) portables, about the size of a
piece of writing paper, are called notebook computers. Subnotebooks are
(smaller) than notebooks. You can hold the (smallest) computers in one hand.
They are called handheld computers or palmtop computers.