This utility secures your privacy by searching and removing trails that were left by your Internet browser and various web-sites on your disk after you browsed the Internet.
This trails are generally left to speed up your access to familiar web-sites and to store your preferences, but a person that got an access to those files can break your privacy and see what web-sites were visited by you.
Protect your privacy by removing most of the trails. Keep the information about web sites that you visit very often only. The cleaning process also has a minor benefit of freeing up some of your hard drive space that was used to store Internet trails.