The term 'spyware' refers to a broad category of items of malicious software, designed to intercept or take partial control of a computers operation without the consent of the computer operator.
Taken literally, 'spyware' suggests that it is software that monitors or spies on the user, without their permission. However the term Spyware has also come to refer more broadly to any software that uses a computers resources for the benefit of a third-party.
Spyware does not usually self-replicate, unlike some viruses.
Spyware exploits infected computers for commercial gain. For example AdWare is the showing of popup (and/or or other) advertisments to the computer user as they surf the internet or use certain programs.
Spyware can steel your personal data, and monitor your every key stroke.
Keep Spyware OUT of your PC!
Recommended spyware removal tools: Ad-aware, SpyBot, Trojan remover
Tip: do not use antispyware unknown tools.