Amazon Alexa Voice Services is a cloud-based voice service that enables you to interact with your devices using natural language voice commands. With Alexa, you can control your compatible smart home devices, access music, news, weather, and other information, and even shop online. Alexa is always learning and
From Wikipedia
Amazon Alexa, or simply Alexa, is a virtual assistant technology marketed by Amazon and implemented in software applications for smart phones, tablets, wireless smart speakers, and other electronic appliances and at Alexa.com.