Computer Virus With the rapid development of information technology , computer virus is becoming another security threat in our life. Computer virus is a program written by the people which can damage your computer system when the computer is running. It can't exist independently, it's always hidden in other executable programs, it's destructive, infectious and latent. When your computer is infected by the virus, it will make the machine work abnormally or cause your computer to crash. Now, I'm gonna talking some characteristics of the virus. First of all, it's parasitic, it's hidden in some programs, when the program is running, the virus will begin to destroy your PC; Second, it's infectious, it can be copied and spread to other computers swiftly; Third, it's latent, you can hardly find it out when the parasitic program isn't running; Fourth, it's invisibility, you can't find it out by yourself, you just can find it out by using anti-virus software. All these above are the characteristics of computer virus. How to prevent the virus and keep your PC safe is very important. First, you should strengthen your awareness, if you want to use the USB flash disk to copy something, you should scan the USB flash disk by anti-virus software to make sure it's safe;Then, when you surf the web, you must pay more attention to make sure the website is safe and legal. Finally, develop a good habit to scan your computer regularly is very necessary. 本文来源：https://www.wddqw.com/doc/465d24c7142ded630b1c59eef8c75fbfc77d9496.html