What is the difference between caramel, butterscotch, english toffee and butter toffee?

Caramel is made with sugar, milk and/or cream, butter and sometimes vanilla where as butterscotch is made with brown sugar. Toffee is butterscotch but it has been cooked for longer. The main difference is the different sugars and that toffee and butterscotch are richer rather than sweeter containing more butter than caramel.

English toffee is typically made with brown sugar, which provides it a deeper, richer style, whilst butter toffee is American and many times basically has usually happening sugar, meaning you style the butter in it greater.

a good place to compare the recipes for each of these is at

http://www.candy.about.com/

caramel is chewey, butterscotch is mostly flavor, toffees are hard candies

Bakin' deserves the nod - that's exactly right. The other answer is just plain daft.