The Golgi Apparatus is a large Organelle comprised of multiple stacks of flat discs known as cisternae, with several hundred cisternae in a stack known as a Dictysome. located in the cell membrane, it is involved in the transportation, sorting, and altering of proteins within a cell. It is able to produce vesicles that are used to bring proteins to structures like endosomes or lysosomes.
Articles:
Media:

Image illustrates a diagram of the Golgi Apparatus and its different sections. Credited to Kelvinsong under the Creative Commons Attribution 3.0 Unported license.

Longitudinal Microtubule
Longitudinal Microtubule
Dictyosomes
Image depicts the cross section of a Tetrahymena cell and the cell structures of interest within it. Credited to Professor Richard Allen and his Image Collection.