Tiered link building uses two layers of links to boost your site’s ranking....

https://wakelet.com/wake/wwUuOxdzjbWfOWfGRSIHW

Tiered link building uses two layers of links to boost your site’s ranking. Tier 1 links point directly to your main site, adding strong authority. Tier 2 links support those Tier 1 links, making them more powerful