According to Electronic Concept, oxidation is a chemical process which involves the loss of one or more electrons by atoms or ions. Reduction is also a chemical process that involves the gain of one or more electrons by atoms or ions.
Oxidising Agent and Reduction Agent:
An oxidising agent (oxidant) brings about oxidation of a substance and itself gets reduced and a reducing agent (reductant). On the other hand, it brings about the reduction of a substance and itself gets oxidised.
Oxidising and Reduction Take Simultaneously:
In a redox reaction, an oxidising agent reacts with a reducing agent and in the reaction oxidising agent is reduced and the reducing agent is oxidised.