unity close application button code example

Example 1: application.stop unity

using UnityEngine;
using System.Collections;// Quits the player when the user hits escapepublic class ExampleClass : MonoBehaviour
{
    void Update()
    {
        if (Input.GetKey("escape"))
        {
            Application.Quit();
        }
    }
}

Example 2: exit game unity

//Quit/Stop Game
Application.Quit();