Template tags are an immensely valuable part of WordPress, especially when developing themes. A WordPress template tag is a PHP function that generates and displays content dynamically on a website. Themes in WordPress contain different templates that theme developers use to display dynamic data. The WordPress themes can use several built-in template tags. The template tags are contained in 9 files in the wp-includes directory.

• wp-includes/general-template.php
• wp-includes/link-template.php
• wp-includes/category-template.php
• wp-includes/nav-menu-template.php
• wp-includes/author-template.php
• wp-includes/post-template.php
• wp-includes/post-thumbnail-template.php
• wp-includes/comment-template.php
• wp-includes/bookmark-template.php