The Uno board is the first in a series of USB Arduino boards, and the reference model for the Arduino platform for an extensive list of current, past or outdated boards see the Arduino index of boards. Arduino DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, Arduino may make changes to specifications and product descriptions at any time, without notice. The Uno board and version 1.0 of Arduino Software (IDE) were the reference versions of Arduino, now evolved to newer releases. Arduino UNO Reference Design USB boot En TM Reference Designs ARE PROVIDED 'AS IS' AND 'WITH ALL FAULTS'.
"Uno" means one in Italian and was chosen to mark the release of Arduino Software (IDE) 1.0. You can tinker with your UNO without worring too much about doing something wrong, worst case scenario you can replace the chip for a few dollars and start over again. It contains everything needed to support the microcontroller simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.
It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header and a reset button. Arduino/Genuino Uno is a microcontroller board based on the ATmega328P (datasheet).
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