Droidsheep’s main task is session hijacking. It steals cookies to get access to the person’s personal account without knowing his/her password. To make it more clearly, when any other person using the same WiFi that your android device is connected, opens any sites like Facebook and log in there then that person’s browser sends cookies. The main work of Droidsheep is to steal or hijack that cookies. Then using that cookies you can get access or open his account and do whatever you want. Just remember, it doesn’t provide you any login information like username or password.