The technological and industrial history of Canada encompasses the country's development in the areas of transportation, communication, energy, materials, public works, public services (health care), domestic/consumer and defense technologies. That the 21st century has become the Internet Age is both literal and metaphorical. The technology that dominates this period of time is wireless technology, cloud computing, HD/3D TV, mega oil, "greentech" and nanotechnology. Most technologies diffused in Canada came from other places; only a small number actually originated in Canada. For more about those with a Canadian origin, see Invention in Canada.