A toilet[n 1] is a piece of hardware used for the collection or disposal of human urineand feces. In other words: “Toilets are sanitation facilities at the user interface that allow the safe and convenient urination and defecation“. Toilets can be with or without flushing water (flush toilet or dry toilet). They can be set up for a sitting posture or for a squatting posture (squat toilet). Flush toilets are usually connected to a sewer system in urban areas and to septic tanks in less built-up areas. Dry toilets are connected to a pit, removable container, composting chamber, or other storage and treatment device. Toilets are commonly made of ceramic (porcelain), concrete, plastic, or wood.