Sometimes the name describes something about the organism. Homo sapiens is the scientific name for you and me, human beings. Occasionally cousins in the same genus interbreed, but they don't usually produce young that are fertile and can breed. Tigons and Ligers are the result of lions and tigers interbreeding in zoos. But they are infertile.
Mules are a cross between a donkey and a horse.
These two species are very, very closely related. When you refer to a living thing by its scientific name, everyone else in the world, whatever their mother tongue, will know exactly which organism you are talking about, even though it will have a different common name. He worked out the system of naming them which has been used ever since. He used the Latin language, because scholarly people all over the world knew Latin. Scientists still use Latin for naming living things.