The nave of Milan Cathedral is a large, central area within the church that serves as the main aisle. Its purpose is to allow worshippers to move freely between the altar and other areas of the building while still providing an open space for congregational prayer. The nave also functions as a place for processions during special ceremonies or religious events, such as Easter Sunday Mass. It creates a visual divide between those attending services and those passing through the cathedral on their way to other parts of the city.