<human>: What is the difference between a compost pile and a compost bin?
<bot>: A compost pile is made up of organic material, such as kitchen scraps, grass clippings, leaves, and other plant materials. It can be any size or shape depending on how much space you have available. A compost bin is a container specifically designed to hold the compost material and provide air circulation for optimal decomposition. Compost bins are typically made of plastic, wood, or metal and come in different sizes.