Positive Influence with the Horse

Someone recently asked the question below. I figured others might not be clear either, so I've shared my answer.

Question:
What is the definition of "positive influence?"

My answer:
Using clear communication through pressure, either physical or spatial, that directs or refocuses the horse's thought, and then his movement.

It is a way to proactively communicate with the horse what your intention is- where you want him to focus, how fast you want him to move, rather than being a passenger, waiting and seeing what the horse does when he had no initial instruction and then critiquing him for not doing what you wanted correctly.