What are cookies
Cookies are small pieces of data, stored in text files, that are stored on your computer or other devices by websites you visit. They are widely used to make websites work, or work more efficiently, as well as to provide information to the owners of the site and to remember you and your preferences. Cookies may be set by the site that you are visiting, or by third parties, such as those who serve content or provide advertising or analytics services on the website.
How long they last
Cookies may be either “session” or “persistent”. A session cookie expires (i.e., is deleted) when you close your browser. A persistent cookie remains until it expires or you delete the cookies via your browser settings. Expiration dates are set in the cookies themselves and may vary in length, depending on the purpose of the cookie.