How is default similar post carousel

Hello,,

How is default Recent post carousel or similar posts
<?php $blog_carousel_recent = get_post_meta( $post->ID, '_kad_blog_carousel_similar', true ); if ($blog_carousel_recent == 'similar') { get_template_part('templates/similarblog', 'carousel'); } else if($blog_carousel_recent == 'recent') {get_template_part('templates/recentblog', 'carousel');} ?>