Supreme Shakti (power) is the form of God. Shakti is described in three forms:
1. Gyan shakti (power of knowledge),
2. Dravya shakti (power of wealth) and
3. Kriya shakti (power of performing deeds)
This is why we worship Shakti in three forms – Maa Saraswati (power of knowledge), Maa Lakshmi (power of wealth) and Mahakali (power of performing deeds).
Any activity that takes place is through these three powers. For example, to make a garland of flowers, we need various coloured and variety of flowers. This is the power of wealth. Making the garland is the power of doing this activity and the knowledge on how to make it is the power of knowledge. The garland will only be complete if these three powers get together.