Phototrophs are organisms that obtain energy from light, primarily through the process of photosynthesis. They convert sunlight into chemical energy, using it to produce food from carbon dioxide and water. Common examples of phototrophs include plants, algae, and some bacteria. These organisms play a crucial role in ecosystems as they form the base of the food chain. By producing oxygen as a byproduct of photosynthesis, phototrophs also contribute to the atmosphere, supporting life on Earth. Their ability to harness solar energy makes them essential for maintaining ecological balance and supporting diverse life forms.