Compost bins are structures built to house compost. They are designed so as to facilitate the decomposition of organic matter through proper aeration and moisture retention. With the proper combination of air and moisture, ideal conditions are produced for the activity of aerobic organisms responsible for the high temperatures that transform the organic materials into compost. The same process will eventually take place over time in a compost "pile" or "heap," but with a bin you can speed up decomposition.
Now that you know what a compost bin does, learn how to make compost in one.