The Arduino UNO is a standard board of Arduino. Here UNO means ‘one’ in Italian. It was named as UNO to label the first release of Arduino Software. It was also the first USB board released by Arduino.
 
It is considered as the powerful board used in various projects. Arduino.cc developed the Arduino UNO board.
 
Arduino UNO is based on an ATmega328P microcontroller. It is easy to use compared to other boards, such as the Arduino Mega board, etc.
 
The board consists of digital and analog Input/Output pins (I/O), shields, and other circuits.
 
The Arduino UNO includes 6 analog pin inputs, 14 digital pins, a USB connector, a power jack, and an ICSP (In-Circuit Serial Programming) header. It is programmed based on IDE, which stands for Integrated Development Environment. It can run on both online and offline platforms.