Data stored on the server
... is only used to improve the website and consists only of:
- requested page, including request arguments
- time of access
- user agent - only if transferred in the data request
- referrer, i.e. the webpage the user came from
It is not suited to identify individual persons.
Data stored on the client
... is used only to avoid showing information twice that the user likely wants to see only once,
i.e. informational popups before the main information is being displayed.