Cookies are small text files, which are sent from your server to the client's hard drive. Cookies are used to store information about the client, so the next times he comes we'll be able to recognize him and his interests. Suppose you're running a big portal that covers lots of different issues from politics to ninja turtles. You retrieve the Cookie from the client's computer and customize your site on the spot for the client's needs, so he'll see the recent interview with Splinter right on the homepage! Get it? Good. Now lets get to it!