The term for organisms that depend on others for food is heterotrophs. Unlike autotrophs, which produce their own food through processes like photosynthesis, heterotrophs must consume organic matter, including plants and other animals, to obtain energy and nutrients. Examples of heterotrophs include animals, fungi, and many bacteria. Their role in ecosystems is vital, as they contribute to the flow of energy in food chains and help decompose organic material, recycling nutrients back into the environment, thereby supporting ecosystem function.