Option: Firewall ON
Access to your website is checked with a set of rules. If the check is negative, the result is logged and the access is blocked with an error code.

Option: Detect only
Access to your website is checked with a set of rules. If the check is negative, the result is only logged, but no further action is taken.

Option: Firewall off
The firewall for the entire domain is disabled. Incoming access to your website is not checked and therefore not logged.