IOT is short form of Internet of Things. These are sensor-based projects using microcontrollers like Arduinos, Raspberry-pi, Node MCU etc. along with various sensors as inputs and output devices like LEDs, displays, motors, buzzers etc. which work according to the programs uploaded to the Arduino board by using Arduino IDE software.
In this site you can get a number of IOT devices and projects, circuit diagrams, codes and videos for experimenting various IOT Projects and enjoy learning IOT.