Computer virus is a program can copy itself to other form to infect the computer without the permeation or knowledge of owner. Virus is a common but erroneously used to refer to other type of malware, adware and spyware program that do not have the reproductive ability. A virus can only spread and affect from one computer to anther computer. Virus is a form of executable code can manipulate the system of computer. When its host is taken to the target computer, for instance because a user sent it over a network or the internet, or carried it on a removable medium such as a FLOPPY DISK, DCD or DVD, and USB drive, of flash drive. Viruses can increase their chances of spreading to other computers infecting file on a network file system that is accessed by another computer because computer is like man he connected its other by its network to talk and share so that virus can pass to other computer because of sharing files connecting them. Computer virus is sometimes used as a catch-all phrase to include all types of malware. Malware include computer viruses, worm, Trojan horse, most all root kits, spyware, dishonest adware, crime ware, and other malicious and unwanted software, including true viruses and viruses are sometimes in confused with computer worms and Trojan horse, which are technically different. A worm can exploit security vulnerabilities to spread itself to another computer with out needing connecting, sharing or transferred as part of host and a Trojan horse is a program that appears harmless but has a hidden agenda. Worm or Trojan horse is like viruses may cause harm to a computer system’s hosted data, functional performance, or networking throughput, when they are executed. Remember all viruses in computer is dangerous if you surfing net prevent malicious thing.

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