A gutter system collects rainwater that lands on the roof and guides it away from the house to prevent structural damage and erosion. Need a bodyguard for your house? Construct a gutter. It also protects the driveway and sidewalk from pooling water. It keeps the roof and the foundation of a house safe from water damage. It is a horizontal open pipe structure that runs around the roof of a house and works as a windshield. Shielding it from rainwater and keeping it safe and healthy.