computer virus
A computer virus is a computer program that can copy itself and infect a computer. A true virus can only spread from one computer to another (in some form of executable code) when its host is taken to the target computer; It can be trasmitted through floppy disk, CD, DVD, USB drive or external hard drive www.allbusiness.com/technology/ computer-software-antivirus . Viruses can spread to other computers by infecting files and folders on a network file system, a file system that is accessed by another computer or even a windows file (operating system file). The term "computer virus" is sometimes used to include all types of malware. Malware includes computer viruses, worms, trojan horses, most rootkits, spyware, dishonest adware, crimeware, Keylogger and other malicious and unwanted software, including true viruses. Viruses are sometimes confused with computer worms and Trojan horses, which are technically different. en.wikipedia.org/wiki/Computer_virus A worm can exploit s