Computer-assisted instruction supplements standard classroom teaching with computers. In some cases, the computer functions as only a source of information. In other cases, the computer acts as a virtual tutor.
Because computers are able to perform calculations instantaneously, they work well as arithmetic tutors. Information displayed on a computer is also easy to navigate, since users can search for information quickly. Users can also use links in documents instead of having to look at a table of contents or index, and laptops are lighter than reference material. Thanks to the Internet, computer-assisted instruction is available across the globe at a low cost, which helps educators reach out to developing areas.