A computer virus is a type of malicious software program ('malware') that, when executed, replicates by inserting copies of itself into other computer programs, data files, or the boot sector of the hard drive. The term 'virus' is also commonly, but erroneously, used to refer to other types of malware, including adware and spyware programs that do not have a reproductive ability.
Malware, short for 'malicious software,' refers to a broad category of malicious programs designed to harm, exploit, or otherwise compromise a computer system, server, or network. It encompasses various types such as viruses, worms, trojans, and spyware.
A type of malware disguised as a benign, useful, and desirable program, such as a screensaver or game. Unlike viruses and worms, Trojans usually gain access through software intentionally installed by the user.
