What is the difference between BeforeTest and BeforeMethod in TestNG

check below code and output

import org.testng.annotations.BeforeMethod;
import org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;

public class Test_BeforeTestAndBeforeMethod {

    @BeforeTest
    public void beforeTest()
    {
        System.out.println("beforeTest");
    }

    @BeforeMethod
    public void beforeMethod()
    {
        System.out.println("\nbeforeMethod");
    }


    @Test
    public void firstTest()
    {
        System.out.println("firstTest");
    }

    @Test
    public void secondTest()
    {
        System.out.println("secondTest");
    }

    @Test
    public void thirdTest()
    {
        System.out.println("thirdTest");
    }
}

output:

beforeTest

beforeMethod
firstTest

beforeMethod
secondTest

beforeMethod
thirdTest