What is the relevance of link building in SEO?

You can search google

Relevant link building means build backlink only on niche site or section.

Create link only those sites which rank above 2 or 3. And link only relevant business fields.

Building Links to those sites which are related to your business mean to say if you have SEO business then get backlinks at those sites which are related to SEO.

Although Google, Yahoo and Bing always give more importance to quality content, link building is still very effective to increase a site's ranking in search engines. This article will help you understand how to implement an efficient policy and link building migliorare as the ranking of your website.