Maritime insurance includes insurance of maritime ships, yachts, boats, insurance of goods in maritime and multimodal transport, freight insurance, insurance of ships under construction, insurance of containers, insurance of platforms for exploration and exploitation of the undersea, liability insurance of maritime shipowners, liability insurance of ship repairers, cost insurance, insurance of various other expenses, rights of property interests. There are also insurance companies operating on the principle of premium insurance and mutual insurance companies - P.&I. clubs, where insurance in these clubs rests on the voluntary principle. A marine insurance contract is a contract in which the policyholder undertakes to pay the policyholder an insurance premium or contribution, and the policyholder undertakes to pay the policyholder, if an event that constitutes an insured event occurs, in accordance with the provisions of the contract, compensation for damage or some other way to fulfill the contractual obligation. The most important document on the concluded insurance contract is the insurance policy, which the insurer hands over to the policyholder upon conclusion of the contract or after.