Redox, oxidation-reduction, and redox reaction are synonyms for the word "reduction-oxidation". Redox refers to a chemical reaction where there is a transfer of electrons between two molecules. Oxidation is the loss of electrons, and reduction is the gain of electrons. These reactions are important in many chemical processes, including combustion, respiration, and photosynthesis. In redox reactions, the reactants are either oxidized or reduced, resulting in the formation of new products. These reactions are used in batteries, fuel cells, and many other technologies. Understanding redox reactions is crucial in many fields, including chemistry, biology, and environmental science.