$ilovephp

Hi fellow PHP Freaks. I am Jayson, 20 years old and I am new to PHP. My question more about the PHP Session. I am aware of the difference of the Cookies and Session, that cookies are stored in the client side and session on the server side. In cookies, it easy to distinguish users since it is managed or stored in the client side, however, in session it is stored in the server side. If so, how do we determine these data stored by session belongs to a particular user? Can we store session ids? I hope my problem was delivered clearly. Thank you.