In the main image you can see how a golgi apparatus works. The golgi apparatus's job is to recieve vesicles (broken down proteins) from the rough endoplasmic reticulum for modification. The proteins have carbohydrates reacted with them so that they form glycoproteins, before being formed into vesicles. Once the vesicles have been reacted they are then excreted out of the cell for transportation around the rest of the body. This process where they fuse with the membrane to be excreted from the cell is called exocytosis. Thr process where vesicles form into the golgi body to be packaged is called endocytosis. The golgi body is also the site of where enzymes are produced.