The energy, which is the womb of the entire creation, which has given birth to all that is, is called Devi, or Divine Mother. Everything in this creation, your body, mind, intellect, ego; the physical and subtle energies, are all the manifestation of that one energy into many different forms, and that one energy is called Devi.
That is why Mother Divine is also called Shakti which literally means energy.
If you have to lift your hand, it requires certain energy, certain strength for something to happen. That energy through which you can lift your hand, comes from the source called Devi.
So, this whole universe is governed by Shakti and tapping into this Shakti is what Navratri is all about. And Pooja (worship) and spiritual practices are a means of tapping into this Shakti. So during the nine nights of Navratri, the Devi is worshipped in all Her names and forms.
“The divinity is everywhere but it is dormant, and Pooja is the process to awaken it.”
As said by Gurudev Sri Sri Ravi Shankar
The Art of Living Founder