Congestion, or blockage, refers to a situation where an area becomes overcrowded or obstructed, leading to a slowdown or halt in movement. This can occur in various contexts, such as traffic congestion on roads, where too many vehicles occupy the same space, causing delays. It can also happen in the human body, such as nasal congestion, where swollen tissues block airflow. In urban planning, congestion is a significant concern as it affects transportation efficiency and air quality. Solutions often include improving public transportation, expanding roadways, or implementing traffic management systems. Addressing congestion is essential for enhancing overall mobility and quality of life in cities.