A tapered blush brush is exactly what it sounds like:  a makeup brush with a tapered, or pointy, end.  The benefit of this design is that it can help create a very sculpted look on the cheeks.  Because the blush is collected on the tip of the brush, when you apply it to your cheeks it provides a denser color.  You can even graduate the color up to your cheekbones for a very contoured look.