Here's a breakdown:

* Autotrophs use inorganic sources of energy to create their own food. They don't need to consume other organisms.

* Photoautotrophs are the most common type of autotroph. They use sunlight as their energy source and perform photosynthesis to convert carbon dioxide and water into sugars (their food). Plants, algae, and some bacteria are examples of photoautotrophs.

* Chemoautotrophs use energy from chemical reactions to create food. These organisms are often found in extreme environments like hydrothermal vents or sulfur-rich areas. They use chemicals like hydrogen sulfide or methane as their energy source.

Let me know if you have any more questions!