An LED (Light Emitting Diode) is an electronic component that emits light when an electric current passes through it.

Today, LEDs are available in a wide range of colors, such as red, green, blue, yellow, and white. There are also RGB LEDs that can display multiple colors, including red, blue, and green, depending on the combinations of the three colors.

The LED allows current to flow only in one direction, from the anode to the cathode. The opposite direction is called the blocking direction, where the LED does not allow current to pass.

Here is how to connect the LED to a Raspberry Pi Pico board:

Here is the program to make your LED blink every 0.5 seconds using the Arduino IDE:

// Define GPIO pin 0 for the LED
const int ledPin = 0;

void setup() {
  // Initialize the pin as an output
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // Turn on the LED (GPIO 0 to HIGH)
  digitalWrite(ledPin, HIGH);
  // Wait for 500 milliseconds
  delay(500);
  
  // Turn off the LED (GPIO 0 to LOW)
  digitalWrite(ledPin, LOW);
  // Wait for 500 milliseconds
  delay(500);
}