Chloroplasts are specialized organelles found in plant cells that are responsible for photosynthesis, the process by which plants convert sunlight into energy. They have a green color due to the presence of chlorophyll, a pigment that absorbs sunlight. Inside the chloroplast, there are several structures, including the thylakoid membrane, which contains chlorophyll and other pigments that capture sunlight, and the stroma, which is a fluid-filled space where the reactions of photosynthesis take place. Through the process of photosynthesis, the chloroplasts produce sugars and oxygen using energy from sunlight. These sugars are then used to provide energy for the plant to grow and carry out other essential functions. Without chloroplasts, plants would not be able to survive or produce oxygen for other living organisms on Earth.