By Swami Harshananda
Indrajāla literally means ‘the snare or net of Indra’.
It is listed among the 64 kalā-s  and represents the special art of producing illusions, especially in a battle field, to confuse and frighten the enemy. These illusions could be in the form of pictures of their future defeats or the appearance of immense storm-clouds.
- The Concise Encyclopedia of Hinduism, Swami Harshananda, Ram Krishna Math, Bangalore