The term for an organism that can make its own food is "autotroph." Autotrophs are capable of synthesizing organic compounds from inorganic materials, primarily using sunlight (in the case of photosynthetic organisms) or chemical energy (in the case of chemosynthetic organisms). In photosynthesis, plants, algae, and some bacteria convert carbon dioxide and water into glucose and oxygen, utilizing sunlight as an energy source. Autotrophs form the foundation of food webs, serving as primary producers that provide energy for heterotrophic organisms, which cannot produce their food and rely on others for sustenance.