Organisms that can photosynthesize are primarily plants, algae, and some bacteria. These organisms contain chlorophyll, a green pigment that captures sunlight and converts it into chemical energy through the process known as photosynthesis. During this process, they absorb carbon dioxide from the air and water from the soil, using sunlight to transform these raw materials into glucose (a form of sugar) and oxygen. This ability to produce their own food makes them autotrophs, forming the foundation of most ecological food webs. Photosynthetic organisms are crucial for life on Earth as they produce oxygen and serve as a primary food source for many other living organisms.