کتاب Fundamental Concepts in Computers and Information Technology اثر حسن رشیدی نشر مرکز چاپ و انتشارات دانشگاه علامه طباطبائی

Students are often relieved to learn that computers have only four basic components:

processor, input, output, and storage. They know that today, the Personal Computer (PC) used is Notebook or Desktop. A notebook computer, also called laptop computer, is a small, thin, lightweight computer that can be as powerful as the average desktop computer. A desktop computer is designed so that the system unit, input devices, output devices and other devices can be fit entirely on or under a desk. Table 1-1 briefly describes the various computer options available for individuals. In these options, the category, size, application and cost of the individual computer are considered. Moreover, an image for each category is shown in the right column of the table.