Aerobic respiration turns glucose and oxygen into water and carbon dioxide. The energy from this reaction is also used to recharge depleted ADP molecules into ATP, a molecule which is used to power many of the functions of the cell.
Aerobic respiration is essentially the inverse process of photosynthesis, as photosynthesis turns water and carbon dioxide into glucose and oxygen, while aerobic respiration does the exact opposite. It should be noted that aerobic respiration can only occur in the presence of oxygen. Without oxygen, anaerobic respiration takes place. Anaerobic respiration only consists of glycolysis, which creates two molecules of ATP. In contrast, the full process of aerobic respiration creates up to 38 ATP, although several ATP molecules are often consumed during this reaction as well.