The reactions involving simultaneous oxidation and reduction?

Reactions involving simultaneous oxidation and reduction are called redox reactions. In a redox reaction, one species is oxidized (loses electrons) and another species is reduced (gains electrons). These two processes happen simultaneously and are always linked. The species that is oxidized becomes a better oxidizing agent, while the species that is reduced becomes a better reducing agent. Redox reactions are important in many biological, chemical and physical processes, including cellular respiration, corrosion, and electrochemistry. Therefore, reactions involving simultaneous oxidation and reduction are called redox reactions.