According to Indian vedic literature mantra are a group of words, sounds that is capable of creating a transformation in yourself. This transformation varies according to the type of mantra used Mantra is oftenly used in meditation to awaken various chakras of the body. for example: The third eye chakra . the mantra " om" specifically used to awaken this chakra. Repeated use of the mantra while concentrating on it leads to the awakening of the chakra.
There are several chakras . Once you awaken all of them you awaken your inner self
A mantra is believed to connect us to the different vibratory levels that exist. Kinda like when our TV or radio tunes into the different wave lengths that bring images and sound to our TV or sound to our radios. Crystals are beveled to a certain frequency that pick up these waves when they are earthed (I think thats what the term is). Inside TVs. Not sure how satelite works if it works the same way.
Mantras therefore tune you in so to speak. Listening to a certain type of music can do that for some too.
A mantra is a sound, syllable, word, or group of words that are considered capable of "creating transformation" (cf. spiritual transformation). Their use and type varies according to the school and philosophy associated with the mantra.
A mantra is a sound that you repeat over and over in your thoughts during meditation, so it blocks other thoughts out from your conscious mind. "Om" is the most popular. A good Sanskrit one is "Om Na ma Shi va ya" which means, "I honor the divinity which resides in me." But it can be any nonsense syllable or set of them. If it is a word it may not work, as you will have associations with that word. Best of luck with your meditation!