Aerobic bacteria, also known as oxygen-consuming bacteria. They possess a complete respiratory chain, contain superoxide dismutase (SOD) and catalase, and are obligate aerobic organisms. They grow and reproduce in an aerobic environment, carrying out metabolic processes that oxidize organic or inorganic substances, using molecular oxygen as the final electron acceptor for aerobic respiration.

Chinese common name: Aerobic Bacteria; Scientific name: aerobic bacteria; Alternate name: Oxygen-absorbing Bacteria; Classification: Survive under aerobic conditions

Anaerobic bacteria are divided into two categories. One type is obligate anaerobes, which can only grow in anaerobic conditions, such as methanogens and Clostridium tetani. The other type thrives better in aerobic environments but can also survive in anaerobic conditions, known as facultative anaerobes, including Escherichia coli, Enterobacter aerogenes, and denitrifying bacteria.