Shortcodes in WordPress are pieces of code that help you embed files or create objects that would normally require lots of complicated, ugly code in just one line.
They were introduced in WP version 2.5 and since then have become one of the most useful features.
When a shortcode is inserted in a WordPress post or page, WordPress will replace it with some other content while displaying the page/post to the reader. In other words, we instruct WordPress to find the macro and replace it with the appropriate dynamic content produced by a PHP function.
For some simple virtual elements such as buttons, Shortcodes may be a little cumbersome. And to kick the ease out of the way, editing existing Shortcode features is not always so friendly.