There are essentially two paths: sustaining and disruptive. When your innovation tweaks the existing product, making it a bit better, it falls into the sustaining category. However, if your innovation completely revolutionizes how the product is used, or it opens the door to a whole new group of customers, then you've ventured into the realm of disruptive innovation. In a nutshell, sustaining keeps things on track, while disruptive turns the track into a whole new highway.