Hello disecor,
In WordPress two type of next and previous links generated by template tags :
1. posts_nav_link() : This template tag used for non-single and non-permalink posts. These links are displayed in index page (or posts home page), archives, categories, and search results pages.
Example : <?php posts_nav_link(' — ', __('« Newer Posts'), __('Older Posts »')); ?>
2. previous_post_link() and next_post_link() : These templates tags is used in single and permalink posts.
Example : <?php previous_post_link(); ?> <?php next_post_link(); ?>
For more prefer WordPress Next and Previous Links
Hope this will helps you.
Thanks !