(JAVA) Why scanner.close()?

Problem

What is the precise reason for adding sc.close(); when I use Scanner class?

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Score: ");
        int score = sc.nextInt();
        sc.close();
    }
}

Reason

Source

java_sc.close();