Question

What is oxidation reaction

Answer 1

It is a reaction in which the oxidation state of a reactant increases.
or
it is a reaction in which Hydrogen is displaced and oxygen is added.
or
it is a reaction in which a reactant lose electron.

point to remember → whenever there is an oxidation reaction then there is a reduction too.

it's called redox reaction.

Answer 2

Oxidation reaction :

In terms of electrons, it is the reaction in which any reactant loses electron.
In terms of oxygen, the gain of oxygen is called oxidation.