IoT devices are pieces of hardware such as appliances, gadgets, sensors, or machines that can connect wirelessly over the internet and collect & share data independent of human support. A physical object can be converted to an IoT device if it can be connected to the internet, can collect & share data and be monitored and managed remotely.
An IoT solution is a combination of devices or other data sources, fitted with sensors and internet-connected hardware to securely report information back to an IoT platform.
Once a system learns how to solve a problem using tools in the cloud or an enterprise's data centre, the learning can then be deployed to an inferencing engine at the edge to run in real-time.
Alexa - As an application user interface that is part of the IoT ecosystem, Alexa can be used to report or command IoT actions.
AI can be used to interpret data from IoT. Information obtained from the physical world, analyzed using data science and AI.