Its a briefly review of Arduino boards.

1. ARDUINO

2. What is Arduino?
● Arduino is a development platform based on a free hardware
electronic board that incorporates a re-programmable
microcontroller and a series of female pins, which allow to
establish connections between the microcontroller and the
different sensors and actuators in a very simple way.

3. Parts of an Arduino board
● Some boards look a bit different from the one below, but most
Arduinos have the majority of these components in common:
● Power (USB / Barrel Jack) ...
● Pins (5V, 3.3V, GND, Analog, Digital, PWM, AREF) ...
● Reset Button. ...
● Power LED Indicator. ...
● TX RX LEDs. ...
● Main IC. ...
● Voltage Regulator.

4. Types of Arduino boards
● Arduino Uno (R3)
● LilyPad Arduino Board.
● RedBoard Arduino Board.
● Arduino Mega (R3) Board.
● Arduino Leonardo Board.
● Arduino Shields.