Take out the element from the root.( it will be minimum in case of Min-Heap and maximum in case of Max-Heap).
Take out the last element from the last level from the heap and replace the root with the element.Perform Sink-Down
All delete operation must perform Sink-Down Operation ( also known as bubble-down, percolate-down, sift-down, trickle down, heapify-down, cascade-down).