Wikipedia
Z-Wave is a wireless communications protocol for home automation. It is oriented to the residential control and automation market and is intended to provide a simple and reliable method to wirelessly control lighting, HVAC, security systems, home cinema, automated window treatments, swimming pool and spa controls, and garage and home access controls. There are hundreds of interoperable Z-Wave products marketed under different brands, and over 35 million have been sold since 2005. Z-Wave was developed by a Danish startup called Zen-Sys that was acquired by Sigma Designs in 2008.
A Z-Wave automation system can be remote controlled via the Internet, using a Z-Wave gateway or central control device which serves as both the Z-Wave hub controller and portal to the outside.