void setup() {
  // the "input pullup" configuration is a technique used to enable 
  //the internal pull-up resistor on a digital input pin. 
  //This internal pull-up resistor is a feature of many microcontrollers,
  //When you enable the internal pull-up resistor on a digital input pin, 
  //it helps ensure a stable and defined logic level 
  //when the pin is not actively being driven to a HIGH or LOW state externally
pinMode(2, INPUT_PULLUP);

}
void loop() {
  int buttonState = digitalRead(2); // Read digital pin 2
  if (buttonState == HIGH) {
    digitalWrite(13, HIGH); // Turn on LED on digital pin 13
  } else {
    digitalWrite(13, LOW); // Turn off LED on digital pin 13
  }
}