Insurance involves pooling funds from many insured entities to pay for losses some may incur. It transfers the risk of a loss from one entity to another in exchange for payment of a premium. The insurer takes on the risk and agrees to compensate the insured in the case of a financial loss. Insurers make money through underwriting, which involves selecting risks and setting premiums, and by investing the premiums they collect. They aim to collect more in premiums and investment returns than they pay out in claims.