Good, flavorful barbecue is the result of three basic ingredients: tender meat, slowly cooked; flavorful, slow-burning wood; and a tasty rub or sauce (or both). The best barbecue restaurants strike a harmonic balance of the three, and are always striving for perfection.
It's hard to say where the term for slow-smoked, sauced meat came from, but there are three basic theories: the Taino Indian term the Spanish translated as "barbacoa"; the Romanian for roast mutton, which is "barbec"; and the French term "barbe a queue," which means "whiskers to tail." All make sense, so you'll have to choose your favorite!