Insurance companies play an important role in society by compensating policyholders for specified events in exchange for premiums. There are two main types of insurance companies: life insurers which provide protection for death, illness, and retirement, and property-casualty insurers which protect against accidents and liability. Both types of insurers pool risks, invest premiums, and must balance premium income with payouts to remain profitable. Strict regulation at the state level oversees insurance company operations and solvency.