There are a lot of things that can make your home smell good. Wall plug-ins, wax melters, oil diffusers, rom spray, and of course candles. Of course, candles are preferred for the ambient effects of the flame, but the one thing these products all have in common is that fragrance oils make them smell so good. But there’s a lot of ambiguity behind the term “fragrance oils” and transparency is one of our deepest values, so here it is: fragrance oil, explained.