Composting is a way to treat solid waste so that microorganisms break down the organic material, helping along the natural process of decay until it can be safely handled, stored and used. Composting makes use of organic waste – such as leaves, fruit and vegetable scraps, soil, water and oxygen. The microorganisms eat the organic waste, breaking it down into simplest component. The finished compost thus produced is rich with fibre and inorganic nutrients, such as phosphorus, potassium and nitrogen, and it makes a natural fertiliser beneficial for the environment.