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ممنون
When a web server sends a response to a web client, most of that response is the HTML document that the browser renders into a web page on your screen: the soup of tags and text that Internet Explorer or Mozilla formats into tables or changes the color or size of. But before that HTML is a section of the response that contains headers. These don't get displayed on your screen but are commands or information from the server for the web client. The headers say things such as "this page was generated at such-and-such a time," "please don't cache this page," or (and the one that's relevant here) "please remember that the cookie named userid has the value ralph."