Spyware and Adware are pretty much the same and both are used to retrieve information from an unsuspecting users computer without his or her knowledge. For example suppose you performed a seach for automobile and you visited a few sites, and suddenly your email is filled with offers to purchase a vehicle. Spyware or tracking cookies were embedded on the computer to monitor your browsing habits. There are several programs which rid your computer of spyware. Windows Defender by Microsoft (free), LavaSoft Adaware, and CC Cleaner (free) are just a few of the programs available to rid you computer of spyware.