Almost everyone believes that computers make our lives easier and give us new ways to learn about the things we are interested in. They make it possible to do many things from the comfort of our own home; We can shop online, keep in touch with our friends online, even go to school online. They provide every information we need and entertain us with a variety of games. a lot of sciences are fully dependent on computers, and we can not think of any communication system without computers. So, the more we use computer, the more easy will be our life and our science and technology will be more developed.