Even though I advise that everyone adopts instead of buying a purebred cat, I love to learn about everything cat related! So behold, my cat breed graph. I might refer to it as a DAG, which is a graph theory term for Directed (meaning that there are edges [aka arrows] indicating the direction between nodes [aka the circles]) Acyclical (meaning that there are no cycles [aka loops]) Graph. This graph shows the relationship between the foundation of different cat breeds.