Session (or Transient) Cookies
Session cookies are stored in your computer’s memory for the length of your browsing session. They become inaccessible after the session has been inactive for a time and are automatically deleted from your computer when the browser is closed. They allow you to move from page to page without having to log-in repeatedly. Persistent (or Permanent) Cookies
Persistent cookies are stored in your computer memory and are not deleted when the browser is closed. They are used to keep your preferences for the website, so they will be remembered for next time you visit the website. They are also used to collect information about the numbers of visitors, the average time spent on a particular page and analyse shopping behaviour on the website. This information is used to find out how well the website works and where it can be improved.
Flash Cookies (or Locally Shared Objects)
You probably have Adobe Flash installed on your computer. Websites that contain Flash can also store small files on your computer that are used in the same way as cookies.
Flash cookies can also back up the data that is stored in other cookies. When you delete cookies, your Flash cookies are not affected. So a website may still recognise you if it backed up the deleted cookie information on a Flash cookie.