IoT (Internet of Things) with ESP (Espressif) and Arduino involves creating interconnected systems using these platforms and various sensors. ESP modules, like the ESP8266 or ESP32, provide Wi-Fi or Bluetooth connectivity, allowing devices to communicate over the internet. Arduino boards serve as microcontrollers that can process data from numerous sensors, such as temperature, humidity, or motion sensors. By integrating ESP and Arduino with sensors, you can build smart devices that collect and send data online, enabling remote monitoring and control.