The classic Nano is the oldest member of the Arduino Nano family boards. It is similar to the Arduino Duemilanove but made for the use of a breadboard and has no dedicated power jack. Successors of the classic Nano are for example the Nano 33 IoT featuring a WiFi module or the Nano 33 BLE Sense featuring Bluetooth® Low Energy and several environment sensors.
![Nano](https://cdn-ak-scissors.b.st-hatena.com/image/square/709a0178281e972f8ca380bda274a2adb400ed87/height=288;version=1;width=512/https%3A%2F%2Fcontent.arduino.cc%2Fassets%2Farduino_logo_1200x630-01.png)