The process of photosynthesis is critical for life on Earth, as it transforms light energy, primarily from the sun, into chemical energy stored in glucose. This process occurs in plants, algae, and some bacteria, utilizing carbon dioxide and water to produce oxygen as a byproduct. Photosynthesis is foundational to food webs, as it serves as the primary energy source for autotrophs, which constitute the base of the ecological pyramid. Without photosynthesis, life on Earth would be drastically different, impacting all living organisms.