In general, cookies are used to retain user preferences and provide anonymised tracking data to third party applications like Google Analytics which I use to understand how people find my website and which content and services they’re most interested in.
As a rule, cookies will make your browsing experience better. However, 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 suggest consulting the Help section of your browser or taking a look at the About Cookies website which offers guidance for all modern browsers.