As evident from the name, link building is the process of securing backlinks from third party quality websites. It is one of the SEO services of a well-planned SEO strategy. The target website outreach third-party website to gain backlinks. The backlinks are hyperlinks/anchor texts linked to third-party websites that click to your website/webpage. It is a way to acquire a number of links for people to link back to your website by creating a backlink profile for your site.
As mentioned above, link building is quite a tricky task. Even for professionals link building is a challenging task of the SEO industry.
You cannot expect a random third party to be willing to provide you with quality internal links. It is only via hiring a professional link building agency that you can acquire links capable enough to earn you optimized results. SEO Link Building Services refers to link building activities performed by experienced SEO agencies to build links.