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Private corporations are classified as profit-making, nonprofit, and public service corporations. A profit-making corporation is a private corporation organized to produce a financial profit for its owners. Examples abound: banks, manufacturing and merchandising companies, and airlines. A nonprofit corporation is organized for a social, charitable, or educational purpose. Churches, colleges, fraternal societies are typically organized as nonprofit corporations. Finally, a public service corporation (also called a public utility) is generally a private company that furnishes an essential public service. Electric, gas, and water companies are examples.