The components of an Arduino board are:
1. Microcontroller: This is the main component of an Arduino board. It is a small computer chip that controls all the operations of the board. For example, the Atmega328P is a popular microcontroller used in many Arduino boards.
2. Input/output (I/O) pins: These pins allow the Arduino board to interact with the outside world. For example, if you want to turn on an LED, you can use one of the I/O pins to send a signal to the LED.
3. USB port: This port is used to connect the Arduino board to a computer. It is also used to upload programs to the board.
4. Power supply: The Arduino board needs to be powered in order to operate. Most boards have a power jack that can be used to connect an external power supply, such as a battery or a power adapter.
5. Reset button: This button is used to reset the Arduino board. This is useful if the board is not responding or if you want to start a new program.
6. LEDs: These are small lights that can be used to indicate the status of the Arduino board. For example, the power LED will turn on when the board is powered up.