The main energy source for most ecosystems on Earth is sunlight. Through the process of photosynthesis, plants convert solar energy into chemical energy, producing oxygen and organic compounds essential for life. This energy transfer forms the basis of food chains, as herbivores consume plants and carnivores consume herbivores. Sunlight supports various ecosystems, from forests to oceans, and is vital for sustaining biodiversity. Without the sun's energy, life as we know it would be impossible, as it drives weather patterns, affects climate, and supports the growth of vegetation that provides food and habitat for countless organisms.