As Google Search is done on PageRank, which is an algorithm that sees at the quantity and the quality of backlinks as an outmoded concept, and it is also considered as one ranking factor. 

Here are the Facts

1. Quantity of mentioned domains 
2. Backlink Jurisdiction 
3. Dofollow and Nofollow 
4. Applying Anchor Text 
5. Relevance 
6. Traffic 
7. Non link based Off-Page SEO

For more information, visit SEO Services in Chennai.