The organisms that convert energy from the sun into food are called photoautotrophs.

Here's a breakdown:

* Photo: Means "light"

* Auto: Means "self"

* Troph: Means "nourishment"

So, photoautotrophs are organisms that use light to make their own food. The most common examples are:

* Plants: They use photosynthesis to convert sunlight, water, and carbon dioxide into sugars (glucose) for energy.

* Algae: These single-celled organisms also use photosynthesis to make their own food.

* Some bacteria: Certain types of bacteria, like cyanobacteria, also perform photosynthesis.

These organisms are the foundation of most ecosystems. They produce the food that directly or indirectly supports all other life forms on Earth.