Components of Arduino Uno board

The important components of the Arduino Uno Board are shown below −

The following table contains the description for each of the labels −

17-12 V Barrel Jack
2Voltage Regulator
316 MHz Crystal Oscillator
4USB - B Port
5Reset Button
6Digital Pins
7ICSP Pins (SPI can be accessed from here)
8ATmega328P microcontroller
9Analog Pins
10Serial Port TX RX LEDs
11USB to UART Conversion IC
12Built-in LED (connected to pin 13)