In general, cookies are used to retain user preferences, store information for things like shopping carts, and provide anonymised tracking data to third party applications like Google Analytics. My site only uses technical and analytic cookies. The first ones are necessary for normal navigation, whereas I need the second ones because I use Google Analytics to see some anonymous information on the use of my site.
Though the cookies aren’t bad, you may prefer to disable cookies on this site and on others. The most effective way to do this is to disable cookies in your browser. I recommend you to consult the Help section of your browser or taking a look at the About Cookies website which offers guidance for all modern browsers.