In many cases when you download and install a program, the install will state that these programs will be installed along with the program you downloaded.
The types of programs that AdwCleaner targets are typically bundled with free programs that you download from the web. By using AdwCleaner you can easily remove many of these types of programs for a better user experience on your computer and while browsing the web. AdwCleaner is a free program that searches for and deletes Adware, Toolbars, Potentially Unwanted Programs (PUP), and browser Hijackers from your computer.