The phrase "to protect the policyholder" means to keep the person who owns an insurance policy safe and secure, by ensuring they receive the benefits and coverage outlined in their policy. Full definition
This rider that is attached typically to a life insurance policy protects policyholders from being left uncovered. (usacoverage.com)
For homeowners insurance, for example, liability coverage protects the policyholder against financial loss if they are sued and found legally responsible for someone else's injury or property damage. (tunnellinsurance.com)
Auto insurance protects the policyholder against financial loss in the event of an incident involving a vehicle they own, such as in a traffic collision. (en.wikipedia.org)