What is the difference between server-side languages like PHP and client-side languages like JavaScript?

Server-side languages like PHP run on the server and process data before sending it to the client, while client-side languages like JavaScript run on the user's browser and manipulate the data after it has been received. PHP is used for server-side scripting to generate dynamic web pages, interact with databases, and handle server-side tasks, while JavaScript is used for client-side scripting to enhance interactivity, validate forms, and manipulate the DOM.

<?php
// PHP code snippet
echo "Hello, World!";
?>