Heuristics are conventions specified to help you solve problems.
When a issue is large or complex, and the optimal solution is
unclear, employing a heuristic lets you start making progress
towards a resolution even though you can’t envision the entire path
from your beginning point.
Suppose your goal is to drive to the store, but there’s no road to
follow. An illustration of a heuristic would be: Head directly
toward the store till you reach an obstacle you can’t cross.
Whenever you contact such an obstacle, follow it around to the right
till you’re able to head toward the store again. This isn’t the most
levelheaded or comprehensive heuristic, but in a lot of cases it will
work just fine, and you’ll finally reach the store.