A city bus is a public transportation vehicle designed to carry passengers within urban and suburban areas. It operates on fixed routes with designated stops and is built to accommodate frequent boarding and short-distance travel. City buses typically seat between 30 and 50 passengers, with additional standing space to increase overall capacity during peak hours.

Most city buses feature wide doors, low-floor designs, and accessible entry systems to allow easy boarding for passengers with mobility needs. Interiors are arranged to maximize standing room and facilitate passenger flow. Power systems vary and may include diesel, compressed natural gas, hybrid, or fully electric drivetrains.

City buses play a central role in urban mobility by providing affordable and flexible transportation. They help reduce traffic congestion and per-passenger emissions compared to private vehicles. Due to their adaptability, city buses remain one of the most widely used forms of public transit worldwide.