Google uses SEO to determine which websites should be ranked highly for each search term entered into their search engine. Without advanced SEO, it would be quite simple to manipulate the search engine results so that the website with the greatest number of links or pages that could be produced by the software consistently appeared at the top of the list.
Users trust search engines, and landing in the top spot of the search results tells users that your website is a reliable source. The higher you rank in search results pages, the more visits and traffic your website will gain.
Additionally, SEO enhances user experience, increasing the likelihood that customers would return for more.