Public transport (also public transportation, public transit, or mass transit) comprises passenger transportation services which are available for use by the general public, as opposed to modes for private use such as automobiles or vehicles for hire.
Public transport services are usually funded by fares charged to each passenger, with varying levels of subsidy from local or national tax revenue; fully-subsidised, zero-fare services operate in some towns and cities.
Public transport can consist of rapid transit (including subways, undergrounds etc.), trams and light rail, commuter trains, buses, van pool services, paratransit services for senior citizens and people with disabilities, ferries, water taxis, or monorails.
Public transport is provided by a company or authority that operates a fleet of vehicles. They may or may not be regulated or subsidized by authorities. The infrastructure used may be exclusive, or shared with private vehicles.
For historical and economic reasons, there are differences internationally regarding use and extent of public transport. While countries in Old World tend to have extensive and frequent systems serving their old and dense cities, most cities of the New World have more sprawl and much less comprehensive public transport.