Catabolism is the process by which the body breaks down complex molecules into simpler ones, releasing energy in the process. This energy is essential for various bodily functions, such as movement, growth, and maintaining body temperature. During catabolism, substances like carbohydrates, fats, and proteins are converted into smaller units, which can then be used for energy or other metabolic processes. An example of catabolism is the breakdown of glucose during cellular respiration. In this process, glucose is split into smaller molecules, releasing energy that cells use to perform their functions. Overall, catabolism plays a crucial role in maintaining the body's energy balance and supporting life.