Mantras are derived from Sanskrit roots meaning "to think" and "to protect." They are repeated phrases that uplift the mind and provide calmness and happiness. Mantras use specific sounds, words, and frequencies to create resonance with the body's natural frequency, resulting in a soothing effect that calms the mind. There are different types of mantras like siddha mantras and shanti mantras used for peace. Regular chanting of mantras benefits health and well-being by increasing positive vibrations and purification of the mind.