The word mantra comes from two Sanskrit words man, ("to...

The word mantra comes from two Sanskrit words man, ("to think") and tra ("tool'). So the literal translation is "a tool of thought." And that's how mantras are used in Buddhist and Hindu practices, as tools that clear your mind of distractions. Because when you focus on repeating that mantra over and over again, soon the noise will die down and all you will hear is your inner voice.