Amazon's smart speaker family Echo, Dot, Tap, Echo Show, Echo Spot, etc. are all hardware built around the artificial intelligence voice assistant Alexa. Alexa is currently everywhere, not only in Amazon's own Echo devices, but more Third-party devices are built with Alexa, such as thermostats, switches, cars, yoga robots, etc. In addition, there are millions of devices that support Alexa voice control. Amazon opened the Alexa voice platform free of charge in mid-2015, and since then has gradually supported smart home control, step by step witnessing Echo's journey from a cradle giant to a river and lake overlord. Currently Alexa has tens of thousands of skills. Alexa officially calls these skills Skills, most of which are developed by third-party partners.