Tiered link building boosts your website’s authority by using multiple layers...

https://atomic-wiki.win/index.php/What%E2%80%99s_the_Best_Way_to_Track_New_Backlinks_After_Outreach%3F

Tiered link building boosts your website’s authority by using multiple layers of backlinks. Tier 1 links point directly to your site, while Tier 2 links support those Tier 1 sources