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.
Link pyramid is way to represent tiered link building.
Packaged link pyramids are seldomly effective and may be dangerous for the money site because the pyramid may be detected by Google and because the first tier backlinks are often poor links.
This is backlinks creation practices in this main website submit to one website and now this link to submit many other website but after having many Google algorithm update this one is not a good SEO method to rank your website in search engine.
Link Pyramid means level of link building, there are 5 levels of link building and in every level you have to do different link building like in 1st level you have to directory submission after that in next level you try different link building technique.