BBQ is a state of mind...
Low and slow with smoke, nice music, some adult beverages of your choice and enjoyment of the finer things...
Grilling is fast and furious, direct heat, flare ups, hot spots, etc.
Both are and can be quite excellent when done proper...
Like NYC'Que said... can't define it, but you know it when you see it... and I'll add, or smell and taste it.
Minimum definition... Dickey's... not a fan of most chains, somehow this one has gotten a foothold in Kansas City and won't die like Bandana's and Famous Dave's did.