An oxidizing agent (also called an oxidant, oxidizer or oxidiser) can be defined as either:a chemical compound that readily transfers oxygen atoms, ora substance that gains electrons in a redox chemical reactionIn both cases, the oxidizing agent becomes reduced in the process.In simple terms:The oxidizing agent is reduced.The reducing agent is oxidized.All atoms in a molecule can be assigned an oxidation number. This number changes when an oxidant acts on a substrate.Redox reactions occur when oxidation states of the reactants change.