Here's a breakdown:

* Nucleolus: A small, dense, spherical structure located within the nucleus of a cell.

* Ribosomes: Tiny organelles responsible for protein synthesis. They translate genetic information from messenger RNA (mRNA) into proteins.

The nucleolus is essentially a ribosome factory. It assembles the components of ribosomes, which are then transported out of the nucleus into the cytoplasm where they perform their protein synthesis function.