Photosynthetic organisms are living beings that can convert light energy, usually from the sun, into chemical energy through a process called photosynthesis. This process primarily occurs in plants, algae, and some bacteria. During photosynthesis, these organisms use carbon dioxide and water to produce glucose and oxygen, which are essential for their growth and survival. These organisms play a crucial role in ecosystems as they form the base of the food chain. By producing oxygen and organic matter, photosynthetic organisms support life on Earth and help regulate atmospheric gases. Their ability to harness solar energy also contributes to the planet's energy balance.