Computer viruses are malicious programs that can copy themselves and infect other computers. Malware includes software installed without consent that can display advertisements or collect user information. Antivirus software detects and removes malware like viruses, worms, and trojans from computers. Computer worms are self-replicating programs that can copy themselves to other networked computers without user interaction.

1. Computer Virus A computer virus is a computer program that can copy itself and infect a computer.