SEO is good for the visibility of your brand
When people are looking for your products and services, you obviously want to appear as high as possible in the search engine rankings.
It's not enough for people to click on your link to join Google's ranks, it's even more advanced.
In fact, there are hundreds of factors that are calculated to appear in the search results.
For example, most users do not just do a single search, click on some websites, and finish.
They search, click on certain sites, modify their search terms, carry out a new search, click on certain sites, refine their search terms, carry out a new search, etc.