Mangal Puja is performed to less the effect of planet Mars. Who is considered to be very powerful planet in Astronomy.  Planet Mars is know by many names , due to its qualities (Mangal, Kuja , Angarak, Lohitang). As the name Mangal signifies prosperity (Sukh Samridhi), so it is considered to be the most important planet in Birth Chart for marriage, child birth and happiness.  In case when a person suffering from AMANGAL in life one should perform shanti.