Yantras are usually used for counteracting the harmful effects of
planets. Besides countering negative effects, Yantras also increase the
planets' beneficial aspects in our lives. Yantras and mantras are
connected together since each Yantra has a corresponding mantra. The
yantras are also representative of different deities. According to
Ayurveda, there is also a definite relationship between Vedic talisman
and the elements of Earth, Water, Fire, Air and Ether.By proper prayers and perfect recitation of specific mantras, the material elements can be invoked to move in the way desired by the worshiper. This is not magic but a highly evolved and developed science for exercising some control in this regard.
Yantras are divided on the basis of certain criteria. Thus, the different types of Yantra are :