Tiered link building uses two levels of backlinks to boost your site’s...

https://meet-wiki.win/index.php/Agency_vs_DIY_Link_Building:_How_Do_I_Choose%3F

Tiered link building uses two levels of backlinks to boost your site’s authority. Tier 1 links point directly to your website, providing strong, high-quality signals. Tier 2 links support those Tier 1 links by linking to them, helping increase their power