Mantras relate to the repeated chanting of auspicious lines or words to overcome the problems. Each root word produces a sound that activates a different center in the human body which correlates to the particular planet.
Yantra is a mystical diagram, an instrument or an appratus to represent gods and deities. Yantra, the most efective remedy, is used when the process of remedy has to be followed for a longer period and when it is not possible to practice other remedies. Yantra is the visible means to gain power, wealth and nullify the malefic effects of planets. Yantra needs to be purified by auspicious mantras for effective results. The remedies do not bring about success directly but they just help overcome the obstacles and difficult situations. Remedies can not substitute the efforts that are mandatory to achieve the goals.