Sewer pipes are underground tubes that carry wastewater and sewage away from homes and buildings to treatment facilities. They are typically made of materials like PVC, clay, or concrete, designed to withstand the corrosive nature of waste and prevent leaks. These pipes are part of a larger sewer system, which includes manholes and treatment plants. Proper maintenance of sewer pipes is essential to prevent blockages and overflows, which can lead to environmental issues and health hazards. Regular inspections help ensure that the system functions effectively and safely.