Z-Wave is a wireless communications protocol used primarily for home automation. It is a mesh network using low-energy radio waves to communicate from appliance to appliance, allowing for wireless control of residential appliances and other devices, such as lighting control, security systems, thermostats, windows, locks, swimming pools and garage door openers. The below videos explain Z-wave in varying levels of detail but will help you under stand what Z Wave is.

For more detailed information visit : https://en.wikipedia.org/wiki/Z-Wave