Spyware is computer software that is installed surreptitiously on a computer to intercept or take partial control over the user's interaction with the computer, without the user's informed consent. While the term spyware suggests software that secretly monitors the user's behavior, the functions of spyware extend well beyond simple monitoring.

Spyware programs can collect various types of personal information, such as Internet surfing habit and sites that have been visited. It can also interfere with user control of the computer in other ways, such as installing additional software, redirecting web browser activity, accessing websites blindly that will cause more harmful viruses, or diverting advertising revenue to a third party. Spyware can even change computer settings, resulting in slow connection speeds, different home pages, and loss of programs.

Once spyware software gets installed it begins monitoring activities on the internet and transmits all the information to its owner who is usually an advertiser of some sorts. Spyware software is detrimental to your interests as it may record your internet history, passwords, and keystrokes, and some spyware can also record private and confidential information.

It therefore becomes essential to install a spyware blocker or anti-spyware software. It is important to run spyware removal software daily to remove any threats to your personal information.