All About Cookies.org
Webpages have no memories. A user going from page to page will be treated by the website as a completely new visitor. Session cookies enable the website you are visiting to keep track of your movement from page to page so you don't get asked for the same information you've already given to the site. Cookies allow you to proceed through many pages of a site quickly and easily without having to authenticate or reprocess each new area you visit.
Session cookies allow users to be recognized within a website so any page changes or item or data selection you do is remembered from page to page. The most common example of this functionality is the shopping cart feature of any e-commerce site. When you visit one page of a catalog and select some items, the session cookie remembers your selection so your shopping cart will have the items you selected when you are ready to check out. Without session cookies, if you click CHECKOUT, the new page does not recognize your past activities on prior pages and your shopping cart will always be empty.
You can adjust your session cookies through the settings feature of your browser.
Without cookies, websites and their servers have no memory. A cookie, like a key, enables swift passage from one place to the next. Without a cookie every time you open a new web page the server where that page is stored will treat you like a completely new visitor.
Websites typically use session cookies to ensure that you are recognised when you move from page to page within one site and that any information you have entered is remembered. For example, if an e-commerce site did not use session cookies then items placed in a shopping basket would disappear by the time you reach the checkout. You can choose to accept session cookies by changing the settings in your browser.
To find out more, please check out the manage cookies section