Final answer:
Oxidation-reduction reactions, or redox reactions, involve the transfer of electrons. Oxidation is the loss of electrons, while reduction is the gain of electrons. Redox reactions are common in organic and biological chemistry.
Step-by-step explanation:
An oxidation-reduction reaction, or redox reaction, is a chemical reaction that involves the transfer of electrons. Oxidation is the full or partial loss of electrons or the gain of oxygen, while reduction is the full or partial gain of electrons or the loss of oxygen. Redox reactions are common in organic and biological chemistry, such as aerobic respiration and photosynthesis.