Generally, tippet and leader both are monofilament nylon. But the leader has differents diameters in its both edge. Its one tag ends diameter is more extensive, which you can say butt end or business start edge. It is attached to the fly line. Another side of the leader is a smaller diameter where you are fastening the fly with it. As per its durability, length, and width, it is enough little expensive fishing elements
On the other hand, tippet help to prevent the damage of the leader frequently change the fly is liable for it.