Here's a breakdown:

* Photoautotrophs: These organisms use sunlight to produce their own food through photosynthesis. Examples include plants, algae, and some bacteria.

* Chemoautotrophs: These organisms use energy from chemical reactions to produce their own food. They don't need sunlight. Examples include certain bacteria found in extreme environments like deep-sea vents.

Let me know if you'd like to know more about autotrophs or the processes they use!