There are over 3.5 billion searches daily on Google and each of those searches can have millions of results. Unfortunately, only a handful of results are visible to the user and the rest are virtually non-existent because they're on the second page of the result's page. The odds of a user to click on the site at the bottom of the first page is 100 to one and that increases exponentially for those sites that are in the subsequent pages. The job of the search engine is to show to the user the most relevant, useful, and well-recognized contents among the multitude of websites on the internet. This is where SEO comes in, it helps you make your website and its contents rise above the myriad and place it at the top of the result's first page.