Here's a breakdown:

* Amino Acids: These are the building blocks of proteins. There are 20 different amino acids that can be combined in various sequences to create a wide variety of proteins.

* Polypeptide Chains: Amino acids are linked together in chains called polypeptide chains.

* Proteins: One or more polypeptide chains, folded into a specific three-dimensional shape, make up a protein.

It's important to note that proteins are synthesized (made) within cells at structures called ribosomes. Ribosomes read the genetic code from messenger RNA (mRNA) and use it to link amino acids together in the correct order to create a specific protein.