Public transportation is a system of vehicles that anyone can use by paying a fare, allowing people to travel around a city or region without owning a car. Buses, subways, trains, streetcars, and ferries are all forms of public transportation.

Instead of everyone driving their own vehicle, public transportation lets dozens or even hundreds of people share the same ride. A single subway train might carry 1,000 passengers, replacing hundreds of individual cars on the road. This makes cities less congested and helps people who can't drive, like kids, get around more independently.

Different cities have different systems. New York City is famous for its subway, San Francisco for its cable cars, and many smaller towns rely mainly on bus routes. In some places, public transportation is so good that many families don't need to own a car at all.

The word public here means “available to everyone,” and distinguishes these systems from private vehicles or hired services like taxis. When someone says they “take public transit” or “use public transport,” they mean they regularly ride buses, trains, or other shared vehicles rather than driving themselves. Good public transportation systems run frequently and reliably, making it easy for people to get to work, school, or anywhere else they need to go.