summary

1.A computer is any device that has the ability to input,output,process, and store data or information.2.General purposes computers can do different kinds ofjobs such as writing letters.drawing pictures,doing calculations and surfing the web.3.Desktop computers are general purposes computers.4.Special purposes computers are expensive and cannot be used for other purposes.5.The computers in the cockpit of an airplane or traffic light system are examples of special purposes computers. 6.Computers are getting cheaper and more complex.7.Programmes are instructions for processors .Operating Systems and applications are 2 types of proggrames.8.An Operating System is a set up of proggrames that provide basic services like printing and saving.9.Windows XP,Linux and mac OS are examples of Operating Systems.10.An application performs specific tasks.11.Examples of applications are WordPerfect for writing reports and Dreamweaver for designing Web pages.