We can understand SEO importance by breaking it into three parts:
Organic search results: SEO can increase your webpage’s visibility higher on the search engine result page (SERP). So if you can make your web pages user-friendly to the audiences and with relevant content, you may get organic or unpaid results that can make your web pages rank higher on search results.
Quality of organic traffic: By getting ranked on the Search Engine Result page, you can get more quality full organic audience than running any paid promotions like a PPC campaign. This can give you an actual targeted audience and help you to generate more sales and revenue.
Quantity of organic traffic: the number of audiences who reach your site via organic search results. Most of the audiences click on the top 5 results, which is why it’s important to use your SEO strategy to rank relevant pages as high as you can. The more high-quality visitors you attract to your site, the more likely you are to see an increase in valuable conversions.