About Spyware
Spyware is technology that gathers information about a person or organization without permission or knowledge.

How spyware gets in
Spyware infiltrates a user’s computer via a number of methods. The most obvious sources are the other scum that are designed to wreak binary havoc: Some viruses, worms, and Trojan horses are designed to install spyware on victim computers either by carrying the spyware directly as a part of its pay-load or by downloading it after the virus has successfully implanted itself.

If you search for instructions for removing spyware, make sure you are following accurate instructions on a trusted Web site.