The Spyware is basically software that is residing secretly on the userís computers, which provides information and access to the third party. Here the user is totally unaware regarding the information being viewed by the third party. The spyware cannot be called as a virus. As virus is unnecessary programs that enters your computer without your permission and causes trouble, while the spyware is the software which takes your permission by deceiving you and once you click OK, it enters your system. The spywares are generally used to tracking the movements of the internet users and know the purpose of tracking.
The spyware have been used also beyond simple monitoring. Some unethical uses of spywares are taking bank and credit information of the users, other login details, surfing habits on the internet and collecting any data from the computer. Some countries like Germany and Switzerland, have strict rules against the unethical use of spywares. Find some more information on Spyware in the attached file.