A cookie is a piece of information in the form of a very small text file that is placed on an internet user's hard drive. It is generated by a web page server, which is basically the computer that operates a web site. The information the cookie contains is set by the server and it can be used by that server whenever the user visits the site. A cookie can be thought of as an internet user's identification card, which tell a web site when the user has returned.
First party cookies are set by the website you are visiting and they can only be read by that site.
Third party cookies are set by a different organisation to the owner of the website you are visiting. For example, when using embedded content from, for example YouTube or Google Maps. These sites may then set their own cookies.
All recent versions of popular browsers give users a level of control over cookies.
Users can set their browsers to accept or reject all, or certain, cookies. Users can also set their browser to prompt them each time a cookie is offered. For more information on how to do this, click here