The term spyware is often thought to exclusively define a "code" that monitors a PC user when, in fact, it's actions are much broader. Spyware is defined as a program that not only monitors a people, but does so for the benefit of a third party. These types of programs can track a user's internet activity for the purpose of determining which URL's they visit before sending the results to an advertisement agency. The more concerning spyware programs will attempt to record what the system user types, such as passwords, account numbers and other private information, and may attempt to record the information. The main difference between spyware and a regular computer virus is that it does not duplicate itself as a worm or traditional virus do. As for the prevention and removal of spyware, there are several software designed for this very purpose. When a large portion of spyware occupies a computer, the only way to remove it is to often create a backup disk of important files and fully reinstall the OS using the Master Restore CD-Rom that accompanied the computer purchase. Adware, which is a program that is designed for commercial gain, is fittingly titled as a program that automatically displays or downloads advertisements to a computer. Generally bundled into a program, adware is considered a way for many developers to recover programming and developing costs. Adware and spyware are often one in the same because the Pc user's web activity is often tracked, recorded and may even be sold to a third party without either the knowledge or consent of the individual being monitored. Many programs creators content that adware is not spyware because they clearly indicate their intention to collect and record specific data in conjunction with the software's use. Much like other unwanted tracking or monitoring, PC users are often anxious to put a stop to their information being recorded. Software is available to help block advertisements and remove spyware programs altogether.