I need an explanation for 3,4,5 th rows. Whether it's a method or something. Can anyone please explain me clearly

Question

public class Counter {
public static int COUNT=0;
Counter() {
COUNT++;
}
}

public class MyClass {
public static void main(String[ ] args) {
Counter c1 = new Counter();
Counter c2 = new Counter();
System.out.println(Counter.COUNT);
}
}

Answer 1

Counter (){
COUNT++
}

Is it a method? or Class