persistentcookie, this cookie is set once you‘ve logged on to a website. The next time you visit the website, the persistent cookie will allow the website to recognise you as an existing user or registered user so you will not need to log in before using the services. However if you wish to access or change any of your payment information (like a credit card number) or your registered information,you must log in securely again with your password, even if your computer contains a persistent cookie.
sessioncookie, this cookie is used to identify a particular visit to a website. Session cookies expire after a short time or when you close your web browser.