The Arduino Uno is a microcontroller board based on the ATmega328, featuring 14 digital I/O pins, 6 analog inputs, and a 16 MHz clock speed. It is powered via USB, AC-to-DC adapter, or battery, and differs from previous boards by using an ATmega16U2 as a USB-to-serial converter. Robomart is an online robotics store in India that sells Arduino boards and other robotics products, offering nationwide delivery.