This happens in animals, green plants, fungi and bacteria. This energy is needed for processes like growth, movement, repair, sensitivity and reproduction.
Aerobic respiration is the most efficient form, and requires oxygen.
Some organisms can respire anaerobically when there is a lack of oxygen. Yeast respires both aerobically and anaerobically. Aerobic is better for it, as it can get more energy, however is doesn't die in a lack of oxygen, it simply switches to anaerobic respiration. Humans too respire in 2 ways. Aerobic being the main respiration method.