Disruptive innovation is a term coined by Clayton M. Christensen, a Harvard Business School academic. It applies to any innovation that has the power to transform a particular product or solution or allow a totally novel product or solution to be created.
Video streaming is a great example of disruptive innovation, allowing Netflix, Prime Video, HBO Go, etc. to be developed.
Disruptive innovation can also be used to make existing products more accessible to a wider audience — the rise of Sony’s transistor radios, for example, which at a lower cost and smaller size opened up a market, leading to Walkmans, mp3 players, and eventually smartphone music apps!