They say that GOD is omnipresent and perfect. It is also said that he is the creator of this universe. But why did he create this Universe at all? What was the need?

God did not create the universe. You have projected it. When you do not see a rope lying on the ground in the dark, the ignorance of the rope creates the illusion of the snake. Similarly, when you do not understand God the ignorance of God creates the misapprehensions of the dream and waking states.