In plumbing, what is the purpose of a downspout?

The primary purpose of a downspout in plumbing is to transport water from gutters vertically down to the ground or drainage system. When it rains, water collects in the roof's gutters, and the downspout serves as a channel to direct this water away from the building’s foundation, preventing potential water damage and erosion. Properly functioning downspouts are critical for effective roof drainage and can enhance the longevity of a home or building by managing stormwater.

While other options mention functions related to plumbing, they do not accurately describe the specific role of a downspout in managing rainwater runoff from rooftops.