A cookie is a small text file stored on your computer. Cookies are normally used to improve the site for the user, for example, to customize a site to the visitor's preferences and choices.
A persistent cookie remains on your computer for a specified period. A session cookie is stored temporarily in your computer's memory while the visitor is browsing the website. Session cookies are deleted when you close your browser.
If you do not want to allow cookies, you can choose to change the settings on your browser so that they are not accepted.