An ecosystem is a system that includes all living organisms such as plants, animals, and microorganisms in an area, as well as the physical environment like soil, water, and air in which they live. In an ecosystem, the various living organisms interact with each other and their physical environment. The biotic components of an ecosystem are the living things like plants, animals, and microorganisms that directly or indirectly influence other organisms. Biotic components include producers like plants that use sunlight to produce their own food, consumers like herbivores and carnivores that depend on producers, and decomposers like saprophytes that break down dead matter.