The primary “sorting centers” of cells, and the mechanism for glycosylation of (i.e., adding oligosaccharide and polysaccharide branches onto) proteins; before those proteins are then transported by transfer vesicles to lysosomes, secretory vesicles, or the plasma membrane. Visually, a Golgi complex is a stack of flattened membranous sacs (usually six sacs in mammal cells and twenty sacs in plant cells).