Malicious Software: Viru ses, Worms, Trojan Horses, and Spyware Have you ever picked up a cold or the flu from another human? Probably. You then spread it to two or three other people through touch or association. Those people spread it to two or three more people each. Pretty soon it seems that everyone on campus or at work is sick. That is how computer viruses are spread. You copy a file from an infected source, use the file, and maybe send it to friends or associates. The virus is now on your computer and spreads to files other than the original. You then send the same or even a different file to a few friends and their computers are infected. A different type of malware called worms can also destroy data on computers or clog network systems with software-generated electronic transmissions. Worms are similar to viruses in that they c an create additional file copies on a computer and generate emails to other computers with the infected file attached. Worms differ from viruses be
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