Reading the State of a Button

int buttonState = 0;
void setup() {
  // put your setup code here, to run once:
  pinMode(8, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  buttonState = digitalRead(8);

  if (buttonState == HIGH){
    Serial.println("ON");
    
  } else{
    Serial.println("OFF");
  }
}