You may know that when you delete any program, it actually destroys the registry that points to the place where the program is stored, but the information remains in the disc. That's a problem if you want to keep your privacy, because if anyone access your computer and want to restore that info, it could be done with no problem.
Eraser allows you to eliminate the files magnetically, it means that it really erases the information.
You can choose from different erase patterns, some of them are recommended by the U.S. Government. You can also configure an erase method manually.
Erase can work with full units or only some files, you decide what you want to delete.