While paid advertising, social media, and other online platforms can generate traffic to websites, the majority of online traffic is driven by search engines.
Organic search results cover more digital real estate, appear more credible to savvy searchers, and receive way more clicks than paid advertisements. For example, of all US searches, only ~2.8% of people click on paid ads.
In a nutshell: SEO has ~20X more traffic opportunity than PPC on both mobile and desktop.
SEO is also one of the only online marketing channels that, when set up correctly, can continue to pay dividends over time. If you provide a solid piece of content that deserves to rank for the right keywords, your traffic can snowball over time, whereas advertising needs continuous funding to send traffic to your site.
Optimizing your site will help deliver better information to search engines so that your content can be properly indexed
and displayed within search results.