A cookie refers to a file that is sent in order to request permission to be stored on your computer. Accepting this file, is created and the cookie is then used to have information regarding web traffic, and also facilitates future visits to a recurring website.
Another function that cookies have is that with them, the web can recognize you individually and therefore provide you with the best personalized service on your website.
You can remove cookies at any time from your computer. However cookies help to provide a better service of the websites. They don’t give access to your computer information unless you want, and provide it directly.
As in the case of cookies, you can configure your browser to avoid storing cookies on your computer if you do not agree with Google’s policies.