Carbon dioxide is the gas produced during the process of respiration. In this biological process, cells break down glucose and oxygen to generate energy, resulting in the production of carbon dioxide and water as byproducts. Respiration occurs in all aerobic organisms, including humans, animals, and some plants. The release of carbon dioxide is essential for maintaining the body's metabolic balance and is expelled from the lungs during exhalation. Understanding respiration is crucial in fields such as biology, medicine, and environmental science, as it highlights the interconnectedness of life and the necessity of gases for sustaining life on Earth.