A breed registry is a system that keeps track of information about different kinds of animals, usually dogs, cats, horses, and other farm animals. It usually keeps track of things like which kind of animal it is, who the parents were, when it was born, and where it came from. The registry also helps identify which animals belong to which breeds, and it helps make sure that animals used for breeding have the right kind of traits. For example, if you have a really great dog, you might send information about it to the registry so it can help other people find a similar dog.