Butterscotch is a type of confectionery whose primary ingredients are brown sugar and butter, although other ingredients such as corn syrup, cream, vanilla, and salt are part of some recipes. The earliest known recipes, in the middle 19th century, used treacle in place of or in addition to sugar.
Butterscotch is similar to toffee, but for butterscotch the sugar is boiled to the soft crack stage, and not hard crack as with toffee. Butterscotch sauce, made of butterscotch and cream, is used as a topping for ice cream (particularly sundaes).
The term butterscotch is also often used more specifically of the flavor of brown sugar and butter together, even where actual confection butterscotch is not involved, e.g. butterscotch pudding.