Aerobic means requiring oxygen. Anaerobic means oxygen is not needed. They both are apart of organisms and their functions, but aerobic is in humans, plants, etc. anaerobic is apart of organisms in harsh conditions, such as archaebacteria.
Aerobic exercise is the body producing energy WITH the use of oxygen (light activities like jogging). Anaerobic exercise produce energy without the use of oxygen and is typically a higher intensity that burns fat AND helps gain lean muscle mass (these are activities like weight lifting).
