KBS_ARTICLE_SLUG constant enables you to change the post type slug of the article post type.
By default the slug is article which means that URLs will look like
http://yoursite.com/articles/ for the article archive and
http://yoursite.com/articles/article-name for individual articles but by defining this constant within your theme’s functions.php file, or any custom plugin file, you can update the slug to be anything you want.
It demonstrates the use of some of the API’s that are built-in to the KB Support core plugin, such as the Settings API which enables you to easily add options to settings pages, or create new sections for your extension. It also demonstrates how to add licensing information to your plugin so that you can ensure that only paying customers are able to receive updates via their WordPress dashboard.