The Golgi Apparatus is an cellular organelle responsible for processing and packaging proteins post synthesis and for preparing the protein for forwarding to its destination.
Present in most organisms cells it is composed of cisternae or sac like structures in membrane layers arranged in stacks with a typical cell containing 40 to 100 stacks. As the protein is progressed through the stacks, Golgi specific enzymes are able modify the protein through glygosylation and phosphorylation thus enabling a shaper targeting of the right protein to the right destination.