To understand why Link Building is essential to Optimization, you need to know how Google search works. When a user searches for something, Google scans through the indexed pages to give the best possible results. The link-building process consists of creating one-way hyperlinks, commonly called Backlinks to a website. Links remain the most decisive ranking factor in Google and other search Engine algorithms. Link Building improves the visibility of the website by ranking it higher in search engine results. When your website ranks higher in a Google Search Engine Result, more people are likely to visit your site as opposed to when you are ranking lower. Ranking higher in search results also improves your trustworthiness, thus establishing you as an industry leader. However, it is essential to note that Google determines the search results based on the quality of the links and not on the quantity of the backlinks to a website.
High-Quality Backlinks:

A high-quality backlink comes from a high-authority website that is relevant, reputable, and well-trusted by the users. There are several factors that Google takes into consideration to determine whether or not a link is of high quality, such as anchor text, the position of the link, and whether the backlink is do-follow or no-follow. Anchor text is the clickable text section of the backlink. Google places enormous importance on Anchor text and the text surrounding it to determine the quality of a link. The position of the backlink is also an important factor – editorially placed links are more significant. When it comes to link building as a strategy to improve website ranking, priority should be placed on acquiring do-follow links. In contrast to do-follow links, no-follow links don’t pass on authority to a website or boost the PageRank.