Mantras are specific sounds or vibrations whose effects are known. When either chanted aloud or repeated silently, they can create a desired effect in any area of your physiology or life—for healing, transformation, and inner awakening. This is, of course, a vast subject and there are mantras for everything from curing snakebites to spiritual awakening. It would take a whole lifetime to master this wisdom; however, we’ll discuss a few of the more practical uses here
https://chopra.com/articles/7-simple-mantras-for-healing-and-transformation