Duration of your visit is a ‘session cookie’ and so it remembers choices made for when you come back is a ‘persistent cookie’
Cookies may be set by the website you are visiting (‘first party cookies’) or they may be set by other websites who run content on the page you are viewing (‘third party cookies’).
What is in a cookie?
It is a simple text file, stored on your computer or mobile device by a website’s server and only that server will be able to retrieve or read the contents of that cookie. It will contain some anonymous information such as a unique identifier and the site name and some digits and numbers. It allows a website to remember things like your preferences or what’s in your shopping basket and each cookie is unique to your web browser.
What to do if you don’t want cookies to be set
Some people find the idea of a website storing information on their computer or mobile device a bit intrusive, particularly when this information is stored and used by a third party without them knowing. Although this is generally quite harmless you may not, for example, want to see advertising that has been targeted to your interests. If you prefer, it is possible to block some or all cookies, or even to delete cookies that have already been set; but you need to be aware that you might lose some functions of that website. To do this use the menu in your browser or find the settings. You will then be able to modify the security and privacy settings to not allow cookies but remember this will not help you browse some websites efficiently.