It is software that brings ads to your computer. Such ads may or may not be targeted, but are "injected" and/or popup, and are not displayed within the form of an ad-sponsored application. Some Adware may hijack the ads of other companies, replacing them with its own. Usually they change the IE homepage and search engine.

Worms are programs that replicate themselves from system to system without the use of a host file. This is in contrast to viruses, which requires the spreading of an infected host file. Although worms generally exist inside of other files, often Word or Excel documents, there is a difference between how worms and viruses use the host file. Usually the worm will release a document that already has the "worm" macro inside the document. The entire document will travel from computer to computer, so the entire document should be considered the worm.

Trojan Horses are impostors--files that claim to be something desirable but, in fact, are malicious. A very important distinction between Trojan horse programs and true viruses is that they do not replicate themselves. Trojans contain malicious code that when triggered cause loss, or even theft, of data. For a Trojan horse to spread, you must, invite these programs onto your computers--for example, by opening an email attachment or downloading and running a file from the Internet.

A computer virus is a program written to alter the way a computer operates, without the permission or knowledge of the user. A virus must meet two criteria:

1. It must execute itself. It will often place its own code in the path of execution of another program.
2. It must replicate itself. For example, it may replace other executable files with a copy of the virus infected file. Viruses can infect desktop computers and network servers alike.