IOT is a technology that enables communication between mobile devices and systems. Currently there are millions of devices connected to the Internet. This increasingly rising discipline gives us the opportunity to learn more about our environment.

Open source IoT platform. Widely used in IoT applications. NodeMCU my favorite in the assembly of prototypes.
This technology allows, through the use of sensors, the remote measurement of physical measurements and the sending of data for processing.
Application Programming Interfaces or the fascinating world of communication between applications.