virus - Programs hidden within other files. They replicate themselves and become part of other programs. They often cause damage by deleting or modifying data., ransomware - Programs that attempt to blackmail a user into making a payment to a hacker. They lock the system until monies are paid, spyware - Programs that monitor user activities and send the information back to a hacker.., worm - Programs similar to viruses except that they are not hidden within other files. They often spread through emails., Trojan - Programs which pretend to be legitimate. They cannot spread by themselves - instead, they deceive a user into installing the program,

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