This widespread popularity is pretty much justified, though. After all, the Arduino boards come with ... That said, we'll be focusing on the Uno R3 in this discussion instead.

The Official Arduino Starter Kit is ideal for STEM learning or for adult hobbyists or professionals interested in these areas. It features the latest UNO R3 microcontroller board and more than 100 ...

Arduino will continue to make available the Arduino UNO R3 and provide support to all those Arduino enthusiasts that have and would like to create projects using its 8-bit AVR microcontroller.