Bacteria can be classified into aerobes and anaerobes. The main difference between the two is the fact that aerobic bacteria require oxygen to remain alive, while anaerobic bacteria do not rely on oxygen for metabolic processes and survival. While aerobes are able to thrive in habitats that have abundant oxygen, anaerobes may die in the presence of oxygen. This type of bacteria does have a growth advantage in areas of the body unexposed to oxygen, and they may become virulent pathogens. The difference in the capacity to utilize oxygen among aerobes and anaerobes is important in the treatment of bodily infections.