Kazaa is the world's most popular virus software. As the first and most efficient online music service to enter the scene, Kazaa spread like wildfire on the internet. One of the software's most popular features is the constant bombardment of advertisements, delivered gracefully through the program's one-of-a-kind interface. As one excited user states; "This software is wicked! Even after I removed it, I still had 24/7 access to all the ads! And that was over six months ago!" It's easy to see why the software retains its standing popularity.