Session ID

A session ID is a server's method of ensuring that it can remember which user is which.

It assigns each user an ID which is passed from page to page. This means that any variables that it needs to store about a users, such as a shopping cart, are able to be applied to the correct user as they navigate through the site.

The server needs to be able to pass the session ID from page to page, and for this it uses either a cookie (if accepted by the browser) or a value in the URL.

If the server fails to pass the ID from one page to the next, all the relevant information about that user is likely to be lost.

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