Desktop computers are designed for use at a desk or table. They are typically larger and more powerful than other types of personal computers. Desktop computers are made up of separate
components. The main component, called the system unit, is usually a desk. Other components,
suchas the monitor, mouse, and keyboard, connect to the system unit
Laptop computers
Laptop computers are lightweight mobile PCs with a thin screen. They are often called notebook computers because of their small size. Laptops can operate on batteries, so you can take them anywhere. Unlike desktops, laptops combine the CPU, screen, and keyboard in a single case.
The screen folds down onto the keyboard when not in use.
Handheld computer
Handheld computers, also called personal digital assistants (PDAs), are bettery-powered computers.
small enough to carry almost anywhere. Although not as powerful as desktops or laptops,handhelds
are useful for scheduling appointments, storing addresses and phone numbers, and playing games.
Some have more advanced capabilities, such as making telephone calls or accessing the Internet.
Instead of keyboards, handheld have touch screens that you use with your finger or stylus(a pen-shaped pointing tool).
Tablet PCs
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