Mantra is a divine combination of divine syllables or sounds which when chanted with devotion, faith and emotion gravitate the concerned God or Goddess or deity and secure their divine blessings. For divine help one must link with divine forces but majority of humans are unaware of these forces and have no link whatsoever. But when an individual starts chanting Mantra related to a particular deity regularly the gap between him and the concerned divine force steadily decreases. By regular use of Mantra a subtle link is formed and through this one could then obtain any desired boon within the power of the deity. One could obtain wealth, prosperity.
Other the sentence I can say that “Mantra”is a power full world which is based of energy sounds.
Saying any word produces an actual physical vibration. Over time, if we know what the effect of that vibration is, then the word may come to have meaning associated with the effect of saying that vibration or word. This is one level of energy basis for words. Another level is intent. Actual physical vibration when coupled with a mental intention, the vibration then contains an additional mental component, which influences the result of saying it. The intent when overlaid upon the waveform of the sound as the carrier wave. Although there is a general meaning, which comes to be associated with mantras, the only lasting definition is the result or effect of saying the mantra. The Indian metaphysical tradition explains that the body is composed of the combination of five elements (Skt. pancha mahabhuta). They are: ether, air, fire, water and earth. These contribute to the tanmatras or subtle properties: shabda (sound), sparsha (touch), rupa (form or seeing), rasa (taste), and gandha (smell). Notice that the first one is sound.