Cortana is a personal digital assistant, which can provide you suggestions, ideas, reminders, alerts, parcel tracking information, flight information and more.
In Windows 10, you can configure Cortana to launch by just saying “Hey Cortana” and can train her to understand your voice.
Adding Cortana and Bluetooth to a UWP app for Phillips Hue
GIHUB: Create intelligent, personalized experiences for users with the Cortana Skills Kit
How to Create Custom Cortana Commands (1/2)