Mantras are energy-based 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 resuzlt 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.
In Hindu thought, while repeating a sacred formula-a mantra, one should put all one's love, thought and will. Thus Japa is not a mechanical activity, but a very intense activity with profound concentration that can clearly be hard to start with, but with practice this becomes easier and more natural. One must repeat the mantra softly with concentration so as to lead the mind to pass beyond everything that is connected with the domain of thought.
In Vedic practices, most ancient techniques and classical Hinduism, mantra symbolizes as a necessity for spiritual advancement and high attainment. Here are some important ideas about mantra, which will enable you to begin a practical understanding of what mantra is and what it can do.