literal meaning of the word "Maya" is illusion.
Any thing which is added to the reality is illusion or Maya,
and this veiling power of illusion is able to create the difference
between 'me' and 'mine', or 'thee' and 'thine'. Maya creates
the ignorance of the individual self. More
on the concept of Maya.
So Maya Shakti is the divine power which brings
out the evolution of this present world. It makes this possible
by an interplay of the three gunas : sattva,
rajas and tamas. Cosmic Consciousness becomes individual
consciousness by its own maya.
In Hindu mythological literature, Maya has been
described in many contexts. Apart from Maya Shakti, Maya also
stands for a demon that was the architect of the demons and
the creator of the magical arts.