The word for comp uter security is used commonly , but the content of a computer can be weak to so me risks if the computer system is not secured and connected to other computers on a network e specially if its connected to the internet which is the biggest network of the networks , and the use of computer networ ks just became more dangerous so the comput er systems became more vulne rable for attacks . Internet and similar facilities that have entered our lives in every direction in the last decade have provided many conveniences for instant messaging as well as other issues an d have brought more other pr oblems that we have experienced before. What happens to us in this situation is that instead of fearing and refusing to use it, or trying to solve the problems . If the end user spends part of the m time doing the question "Ar e the systems safe and secure? ” The most important phase of information security will be passed .