The Golgi apparatus can be compared to a post office in a cell. Just like a post office sorts, modifies, and packages items before sending them to their destinations, the Golgi apparatus processes, sorts, and packages proteins and lipids that are produced in the cell. It modifies these molecules and then sends them to their appropriate locations, either within the cell or outside of it. This analogy helps to understand the essential role of the Golgi apparatus in ensuring that cellular materials are correctly processed and delivered.