Can anyone help me what does session hijacking means, and how to use it..
Every session has an encrypted session ID stored in the cookie or in the URL if cookies can't be used. If that session ID is stolen, for example from the URL, someone can potentially use it to send requests to your script and pose as the person who originally started the session.
So if Secretary Rice logged into the NSA's satellite positioning website using a session, and Habib was able to steal that session ID and use it while sending requests to the website using his own browser, the website would think it was Condalisa and would allow Habib to reposition all of the free world's satellites, thereby interrupting communication and plunging the free world into anarchy and chaos. Airplanes falling from the sky, the earth opening up and swallowing entire cities, mountains becoming valleys and valleys becoming mountains, floods famines, locusts, frogs, etc.etc.etc.
But you're just asking for educational purposes, right? You're not going to destroy the free world with your knowledge, are you?
LoL I Would Like To Know How To Do This To Access Other Peoples Accounts On A Game! Where Could I Learn To Do This?