Module: Ready-made small circuits with specific functions (e.g. modules for Wi-Fi, Bluetooth, relays, or motion sensors) that can be easily connected to the main board.
Boards: The main boards-microcontrollers (e.g. Arduino Uno, Nano, Mega) that serve as the "brain" of your project, where you upload your code.
ESP8266: Affordable and very popular processor with built-in Wi-Fi. Ideal for connecting your projects to the Internet (e.g. sending weather data or remote control).
NodeMCU: Ready-made development board based on the ESP8266 Wi-Fi chip. Combines the capabilities of the Internet with the ease of programming of an Arduino.
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