Hello world

A "Hello, World!" program is generally a simple computer program which displays a message similar to "Hello, World!" while ignoring any user input. A small piece of code in most general-purpose programming languages, this program is used to illustrate a language's basic syntax. A "Hello, World!" program is often the first written by a student of a new programming language, but such a program can also be used as a sanity check to ensure that the computer software intended to compile or run source code is correctly installed and that its operator understands how to use it.

C#
//Example 1
Console.WriteLine("Hello, world!");
//Example 2 For code written as C# 8 or lower
using System;
class Program{
    static void Main(){
        Console.WriteLine("Hello, world!");
    }
}

JavaScript
 alert( 'Hello, world!' );

Python
print('Hello, world!')

PHP
<?php 
echo 'Hello World';