Tiered link building uses two levels of links to boost your website’s ranking....

https://wiki-quicky.win/index.php/How_Do_I_Explain_Tiered_Link_Building_to_a_Client_Without_Jargon%3F

Tiered link building uses two levels of links to boost your website’s ranking. Tier 1 links point directly to your site from quality sources, giving strong, credible signals