Backtrack, the highest rated and acclaimed linux security distribution till date. In simple words its an operating system that comes pre installed with all the software's u need for Hacking... Penetration testing or "Ethical hacking" that is.. :)

Backtrack is a very handy tool. Its lightweight and runs fine on VMware or any other virtualization tools. A person with average interest in hacking can start off with backtrack. Also the beautiful dark interface makes it very interesting.

Want to mess with wireless, exploit servers, perform web application assessment or social engineer a client?? then BACKTRACK is the one stop shop fo u..