redox reaction is another name name of oxidising and reducing reaction
in oxidising agent is a substance which oxidised
and a reducing agent is an agent which reduces 
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Reactions involving oxidation of one substance & reduction of the other or loss or gain of electrons from an atom.
                      Cl₂ + H₂S ---------------> 2HCl  +  S

Oxidizing agents lose oxygen, gain hydrogen and accept electrons. Examples:   Cl₂ , O₂ , Concentrated H₂SO₄ & MnO₂ .

Reducing agents gain oxygen, lose hydrogen and donate electrons. Examples:       H₂S , H₂ , CO , SO₂ , HCl & Na.