Mantras are energy-based sounds.They are primarily used as spiritual conduits, words or vibrations that instill one-pointed concentration in the devotee.Other purposes have included religious ceremonies to accumulate wealth, avoid danger, or eliminate enemies etc. Mantra is a combination of magical/mystical words and sound waves.Mantra is recited to relax mind & to fulfill the desired work.

Recitation of Mantras with a prescribed number of times at different timings to give desired results is called Japa. It should be performed with due faith and all rituals, then it is fruitfull. You must have complete faith in Mantra you are reciting and must know its meaning. Do the things as per prescribed methods. You will experience sensation and vibrations during or at the end of Japa.