According to yogic philosophy, whenever energy exists in the world and whenever power becomes active, shakti is working. Prakriti is the manifestation of this energy in the world.
Shakti is a maternal principle and is considered the provider and source of abundance. It offers nourishment, warmth and security, as well as provides energy and impetus for action.
Both of the pairs, shiva/shakti and purusha/prakriti, are considered to be different aspects of one universal Truth, or two sides of one coin. The Absolute Reality is said to encapsulate both in perfect harmony and simultaneous existence.