Redox or oxidation-reduction is a type of chemical reaction where the oxidation numbers or states of reacting atoms or ions are changed. In chemistry, it also defines by the transfer of electrons from one chemical species to another. Therefore, oxidation is a process that results in the loss of one or more electrons by atoms or ions. Similarly, the reduction is a process that results in the gain of one or more electrons by atoms or ions. Examples of oxidation reactions based on electrons and oxidation number are given below the picture,
Oxidation and reduction are always found to go hand in hand during a redox reaction. Whenever an element or a compound is oxidized, another compound must be reduced.