What is link pyramid:

A link pyramid is a structured form of link scheme using several tiers of links. Link pyramids aim at creating link juice for intermediary and first tier links. It is also a way to prevent sanctions for the money site which is only directly connected with "good quality" first tier backlinks.
 
The backlink pyramid is easy to implement, easy to explain and useful in many ways. The strategy allows you to send high-quality backlinks to your money site, strengthens those high-quality links, and improves the index rate of those backlinks.

On point. I dont think they improve the indexablitly of the links though if anything you are playing a 50/50 game with your first tiers. Because all the lower tier links will either strengthen or weaken that first tier link. The point of it though it not to play that 50/50 game on your money website site
 
The backlink pyramid was one of the first backlinking strategies to be developed ever since Google began placing value on backlinks. The backlink pyramid is easy to implement, easy to explain and useful in many ways. The strategy allows you to send high-quality backlinks to your money site, strengthens those high-quality links, and improves the index rate of those backlinks.
 
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