Organisms that make their own food for energy are called autotrophs. They use a process called photosynthesis to convert light energy from the sun into chemical energy in the form of glucose (a type of sugar). This glucose is then used as a source of energy for the organism's growth and development.

Here are some examples of autotrophs:

* Plants: All plants are autotrophs. They have chloroplasts in their cells, which contain chlorophyll, a pigment that absorbs sunlight.

* Algae: These are single-celled or multicellular organisms that live in water. They also contain chlorophyll and carry out photosynthesis.

* Cyanobacteria: These are photosynthetic bacteria that can be found in a variety of environments, including water, soil, and even the air.

These autotrophs are the foundation of most food chains, as they are the primary producers of organic matter. Without them, all other organisms would be unable to survive.