This first video above does a great job of presenting the basic contours of the field in an easy-to-follow manner. 

This second video below does a greater job of doing so while digging a little bit deeper on the details. 

If you get a chance, make sure to watch both!

Tagged: Ethics, Meta-Ethics, Metaethics, Moral Anti-realism, Moral Cognitivism, Moral Non-Cognitivism, Moral Realism, Philosophy