Here's a breakdown:

* Nucleolus: A dense region within the nucleus of a cell.

* Ribosomes: Tiny organelles responsible for protein synthesis. They read the genetic code from messenger RNA (mRNA) and use that information to assemble amino acids into proteins.

The nucleolus is essentially a ribosome factory. It synthesizes ribosomal RNA (rRNA) and combines it with proteins to create the two subunits that make up a ribosome. These subunits are then exported from the nucleus to the cytoplasm where they can join and begin protein synthesis.