Grilling is a direct heat cooking method in an open environment. BBQ is an in-direct cooking method in a closed environment. We grill hot dogs, burgers and steaks. But we BBQ ribs, chicken and brisket. Sometimes we do a combination of the two methods.
So you may be asking yourself, why would I now discuss this after the Fourth of July? Well, as I have found out, it's never too late to learn something new. Besides, there is a lot more of both to be done this summer and, if you're invited over for a BBQ and the host is doing steaks, you can now enlighten them on your expert knowledge.
Just make sure it's after he has grilled your steak. Nobody likes a know-it-all!
Viva la difference!