Amazon Alexa is the virtual assistant that powers Amazon Echo, Amazon Fire TV, and other devices.
Alexa can be extended with custom skills that can provide features to query custom data, activate or deactivate components, and more. Alexa skills can be built in many languages and using many technologies, but if you're proficient with .NET and Azure Functions, you can use those. More information can be found at https://blogs.msdn.microsoft.com/appconsult/2018/11/02/build-your-first-alexa-skill-with-alexa-net-and-azure-functions-the-basics/.