Search engine optimization (SEO) is the royal road to new customers on the Internet. And to new employees. And to all others who might be interested in your company. If a new customer doesn't get your URL via recommendation, the best way for him to find you is via a search engine. As a rule, this is Google. He enters search terms that are usually related to his needs. You want to be found for these keywords. So, for example, as a doctor, if someone searches for "bad cough treatment". Or as a real estate platform, if someone searches for "three-room apartment Munich". So SEO is important to be found at all.
If your potential new customer doesn't find your business in the organic hits, your only option is to place ads. Since these are becoming more and more expensive (in many areas more than 5 euros per click on the ad), this will cost you an enormous amount of money in the long run. With SEO you save in the medium to long term a lot of money. This is another reason why SEO is not only important, but indispensable for contemporary online marketing.