This document discusses Internet of Things (IoT) applications and networking. It covers:
1) The definition and history of IoT, how it connects devices to the internet using wireless technologies, and projections of over 20 billion connected "things" in the future.
2) Key components of an IoT system including sensing, actuation, networking, communication protocols, and machine-to-machine communications.
3) Challenges of IoT including security, scalability, energy efficiency, and data analytics.