Here's why:
* Modification: The Golgi apparatus receives proteins and lipids (fats) from the endoplasmic reticulum (ER). It further modifies and processes these molecules, adding sugars or other chemical groups. This changes their function and destination.
* Packaging: The Golgi then packages these modified molecules into small membrane-bound sacs called vesicles.
* Transport: These vesicles bud off from the Golgi and travel to other parts of the cell, or even out of the cell itself.
Think of the Golgi apparatus like a cellular post office: it sorts, packages, and delivers the cell's "mail" to the correct addresses.
