worms - replicates itself to spread to other computers, rootkits - hide programs from normal methods of detection to access a computer, adware - add advertisements to generate revenue for its author, virus - corrupt or modify files on a computer, ransomware - encrypt and lock files on the system's hard drive, backdoors - bypass normal authentication procedures, trojan horse - appears to perform a desirable function but facilitates unauthorized access, keyloggers - recording the struck on a keyboard, spyware - gather information about a person without their knowledge,

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