2.9. Cookies
Cookies are small bits of textual information that a Web server sends to a browser and that the browser later returns unchanged when visiting the same Web site or domain. By letting the server read information it sent the client previously, the site can provide visitors with a number of conveniences such as presenting the site the way the visitor previously customized it or letting identifiable visitors in without their having to reenter a password.
This section discusses how to explicitly set and read cookies from within servlets, and the next section shows how to use the servlet session tracking API (which can use cookies behind the scenes) to keep track of users as they move around to different pages within your site.
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