What is the difference between hard work and smart work?

With the help of both we can achieve the result. But the only thing which makes the difference is Time taken.

Hard work consumes more time where as smart consumers less.

We should achieve the result in a smart way by working hard.

In my opinion, smart work may fail Sometime but not hard work. That why I choose to do work hard and but I apply my smartness to remove hurdles in the path of achieving results