A public service company (or public utility company) is a corporation or other non-governmental business entity (i.e. limite partnership) which delivers public services - certain services considered essential to the public interest. The ranks of such companies include public utility companies like natural gas, pipeline, electricity, and water supply companies, sewer companies, telephone companies and telegraph companies. They also include public services such as transportation of passengers or property as a common carrier, such as airlines, railroads, trucking, bus, and taxicab companies.