Redox reaction is defined as a chemical reaction that takes place among an oxidizing substance and a reducing substance.
Reactions in which oxidation and reduction are taking place at the concurrent time are called redox reactions. For example Fe2O3 is reduced to Fe by losing oxygen atoms.
Corrosion is one of the common process of redox reaction in daily life. An iron door gets corrosion from some of the oxygen atoms present in water that oxidize iron thereby, lead to the formation of free hydrogen ions.
Redox reaction occurs because loss of electrons by one substance must be accompanied by a gain in electrons by something else, oxidation and reduction always occur together.
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