Off Page SEO Link Building is just one area of Off-page SEO which includes Social Networking, Helpful Articles and Blogs.
Off-page SEO tells Google what others think about your website so if many highly ranked, highly-trusted websites have links pointing to your pages than Google will assume you have great content. People only reference or share content they like.
Many people think the practice of pointing links to your site is outdated, but this technique is still very important to Google. Google actually has a difficult time determining the value of any web page or web site if there are no links pointing to it.
The consequences of this are a low trust ranking score and low authority rating which tell Google not to rank your site well on their Search Engine Results Page. Here is the complete list of Google’s 200 Ranking Factors as of 2022.