What is a drainage pipe used for?

A drainage pipe is specifically designed to transport waste liquids away from fixtures and appliances, effectively channeling them to a sewer system or septic tank. This function is critical to maintaining sanitation and preventing backflow or leakage that could lead to health risks and structural damage. Drainage pipes are typically part of a larger plumbing system, which may also include vent pipes to ensure proper airflow and pressure within the system, but their primary role is to efficiently remove waste. Other choices pertain to different functions: ventilation pertains to air circulation, structural support relates to building stability, and enhancing water pressure involves supply pipes, making them distinct from the essential function of drainage pipes.