Creme brûlée is a type of custard, but has some distinct characteristics that set it apart from other custard desserts. What makes creme brûlée unique is the process of caramelizing the sugar topping just before serving, creating a brittle, caramelized crust on top of the smooth custard. This combination of a creamy custard base with a crisp, caramelized sugar topping is what defines creme brûlée and makes it a beloved dessert. Traditional custard, on the other hand, doesn't have this sugary crust and is usually served in a more pudding-like form.