How to create shortcode in wordpress platform

add_shortcode()

This function is used to create shortcode.add_action and add_shortcode are the same functions.But the thing is they are used and implemented in different ways.shortcodes also defined in functions.php.we can call it anywhere on post and pages in wordpress.

<?php
function test(){
    echo "<h2>Hello Shortcode</h2>";
    }

add_shortcode("test",test);

?>