Cities: Skylines is a city-building simulation developed by Colossal Order and published by Paradox Interactive. Players design and manage cities from the ground up, controlling zoning, infrastructure, public services, taxation, and transportation networks. The game features realistic traffic AI, detailed economic systems, and dynamic population growth. With extensive mod support and downloadable expansions, Cities: Skylines offers deep customization and strategic urban planning, making it one of the most popular modern city simulation games on PC.