Of course, if you never submit any personal information, the server only knows that someone with your cookie has returned to the Website. It is up to you whether we know anything about you, but the more you tell us about yourself, the more we can help you find information or products you want. The information about what you have ordered is written to a cookie on your computer. When you view your order, the web server simply reads the information from the cookie. When you complete your order, the shipping address and other information are written to your cookie as well, so that when you return again, you don't have to fill all of the information out again.
Some cookies have expiration dates.
When a cookie expires, your browser will simply erase it from your hard drive. Depending on where it came from, a cookie may expire tomorrow, next week, or the year 2010. A cookie that doesn't contain an expiration date will only last as long as your browser stays open. When you close your browser, all session cookies silently disappear. Cookies are generally harmless.