A cookie is a short piece of data that is sent from a web server to a web browser on your machine when the browser visits the server’s site. The cookie is stored on your machine, but it is not an executable program and cannot do anything to your machine.
Whenever a web browser requests a file from the same web server that sent the cookie, the browser sends a copy of that cookie back to the server along with the request. In this way, the server knows you have visited before and can co-ordinate your access to different pages on its website. A server cannot find out your name or email address, or anything about your user’s computer, by using cookies.
You may disable cookies by changing the settings on your browser, although this may mean that you cannot use all of the features of the website.