Functional cookies are used e.g. for a shopping basket, to remember login details or to record the fact that other cookies can be stored. Without these cookies, a website would not be able to function.
Analytical cookies are anonymized and they are used to measure website traffic.
Tracking cookies are used to identify the visitors of a website so that relevant information can be collected.
We also allow the cookies of Google Analytics (the analytics.js variant) so that we can see how many people visit our website, for instance, and which pages are the most popular. More information about the cookies of Google Analytics can be found via this page of Google.