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Spyware
Spyware is a general term for a program that secretly monitors what you do on your computer and what sites you visit. Many companies use spyware to gather data about customers.
Spyware is designed to avoid being detected, and even once detected, can be quit difficult to remove.
Many companies offer spyware removal tools that range in their effectiveness.
If they don't work, you may have to resort to reformatting your hard disk.
(Source:Neungyule Education)