I see this is your first post so just going to give you a few guide lines.
1) Welcome to AGO (Autogeek Online)
2) Using the "search" button, this discussion has been talked about several times over several threads
To answer your question; A sealant is man-made/synthetic. A wax (carnauba) comes from trees. Don't read too much into the labeled name but what the wax actually is. There are some waxes such as Fuzion, but it also uses synthetic, making it a hybrid wax. There are sealants that are labeled polishes. You can use either just a sealant, or two coats of a sealant. You can use a wax by itself. If you want to go the extra step, you can lay down a coat of sealant first, then put a coat of wax on top of it.