Rajas is the creative life force, pure creativity, Shakti.
Out of nothing, the emptiness of pure consciousness, springs all of life. Each thought emerges from the inner silence of pure awareness as potentiality manifests.
Desire and action are expressions of rajas. It is the fundamental desire of the absolute void of the vacuum state to experience itself, and to do so it must manifest as the experiencer, the process of experiencing, and the objects of experience. Rajas is the energy that brings this to life.