| A | B |
| Virus | A program that infects and damages your system software by loading onto your computer without your knowledge and replicates itself. |
| Bomb | A program that resides silently in a computer's memory until it is activated |
| Worm | A program that replicates itself over a computer network and usually performs malicious actions |
| Trojan Horse | A destructive program that masquerades (disguise yourself) as useful software which allows web hackers to make ample changes in your system. |
| Malware | Software designed specifically to damage or disrupt a system. |
| Antivirus | A utility that searches a hard disk for viruses and removes any that are found. |
| Spyware | Any software that covertly gathers user information such as e-mail addresses |
| Anti-Spyware | A utility that is used to remove a Spyware program from the user’s computer without affecting or altering the system’s settings. |