With the technological advances in the internet, we also come accross certain evil faces of the internet: criminal hackers. Governments, companies, and private citizens around the world are afraid that some hacker will break into their Web server and replace their logo with pornography, read their e-mail, steal their credit card number from an on-line shopping site, or implant software that will secretly transmit their organization's secrets to the open Internet. They then turn to ethical hackers for help.
Ethical Hacking services - the positive side of hacking are sold under the modern name of "Network Security Services".
Ethical hackers help their customers to find and plug in the security loop holes in their respective sites. Watch out guys their is more to more...this is just an introduction