Insurance is defined as a contract between an insurer and insured where the insured pays a premium in exchange for the insurer compensating for losses arising from events such as death, accidents, or property damage. It allows individuals to pool risks, with the insurer using collected premiums to cover losses while also investing premiums to generate capital for economic development. The key functions of insurance are providing certainty of compensation for losses, distributing risk across a large number of policyholders, and providing security for insured individuals and their property.