Both aerobic respiration and fermentation are oxidative metabolism processes, and the cells use them to convert biochemical nutrients into energy forms that the body can use, such as adenosine triphosphate, also shortly called ATP, which actually is the fuel of the body.
What is different about the two processes is that aerobic respiration requires oxygen, while fermentation doesn't. However, the biggest difference about them is the end product, which makes aerobic respiration much more effective than fermentation. Aerobic respiration produces whooping 38 molecules of ATP, in comparison to fermentation which has only 2 molecules of ATP as an end product.
