As being in the SEO industry, we all know the latest algorithamic upadte of Google is Penguin update and it harmed many sites rankings badly.
Nowadays, links still remain to be the most important external signal that can help a web site rise in the rankings. Google also depends on link analysis as a way to improve relevancy, discovering how pages are related to each other and in what ways.
Though links aren't everything in SEO, but a large portion of the engines' algorithms is attributed to link-based factors.
Through links, search engines can not only analyze a website’s/page’s popularity based on the number and popularity of pages linking to them but also on metrics like trust and authority.
In light of the focus of search engines on algorithmic use and link analysis, as a search engine optimization expert, growing a website’s link profile or link building is among the top SEO strategies in order to gain traction, attention, top search engine rankings and increase targeted traffic from engines.
