The Arduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328P. It offers the same functionality as the Arduino Uno in a much smaller footprint — perfect for embedded projects where space is tight. Programmed via Mini-USB and powered through USB or an external 7–12V source, the Nano fits directly into a breadboard's spine, making wiring fast and clean. Ideal for wearables, home automation nodes, and any project that doesn't need Uno-sized shields.