Government corporations are entities created by the government to provide specific services or products that may not be adequately supplied by the private sector. They operate like private businesses but are owned and operated by the government. Examples include the United States Postal Service and Amtrak, which serve public needs while aiming to be financially self-sustaining. These corporations are established to fulfill a public purpose, often in areas like transportation, utilities, or housing. They can receive government funding but also generate revenue through their operations. This structure allows them to balance public service with financial viability.