Zorgverzekeraars are health insurance companies in the Netherlands that provide coverage for medical expenses. They play a crucial role in the Dutch healthcare system by offering various insurance plans that help individuals pay for treatments, medications, and hospital visits. These insurers are required by law to offer basic health insurance to all residents, ensuring that everyone has access to essential healthcare services. Additionally, Zorgverzekeraars can offer supplementary insurance for services not covered by the basic plan, allowing individuals to customize their coverage based on personal needs.