This document provides an introduction to computers and how to purchase a personal computer. It defines what a computer is and its basic components and functions, including input, processing, output, and storage. It describes the principal computer components, different types of storage media, system software versus application software, computer networks and the internet, and electronic commerce (e-commerce). It concludes by providing guidance on how to purchase different types of personal computers, such as desktops, notebooks, tablets, and mobile devices.

1. Essential Introduction to Computers How to Purchase a Personal Computer

5. What Are the Components of a Computer?

8. System Unit

16. Computer Software

18. Computer Software

20. Networks and the Internet Local Area Network (LAN) Wide Area Network (WAN)

23. The World Wide Web

40. Essential Introduction to Computers Complete