Link building is necessary for strong SEO. Link building is one of the best way to increase the SEO ranking of your website. But you need something worthy of linking to, and you need people to learn of it, which increases the opportunities for it to be seen by people who will. This is where link building comes in. It’s a structured methodology of publishing some really good stuff, and promoting it with webmasters and influencers who then link to it and share it.