An articulated city bus is a high-capacity public transportation vehicle consisting of two rigid sections connected by a flexible joint. This articulation allows the bus to bend in the middle, enabling it to navigate urban streets while accommodating more passengers than a standard single-unit bus. Articulated buses typically measure 18 meters or more in length and can carry between 100 and 160 passengers, depending on configuration.

The flexible joint is covered by a protective bellows-like structure and allows the vehicle to turn more easily despite its extended length. Most articulated buses feature multiple wide doors to facilitate efficient boarding and alighting, making them well suited for high-demand urban routes.

These buses are commonly powered by diesel, hybrid, electric, or compressed natural gas systems. They are widely used in dense metropolitan areas to increase passenger capacity without requiring additional drivers or vehicles, helping improve efficiency in public transit networks.