SEO optimization includes all On page and Off page actions that we perform on one site, in order to rank it in the top positions in the organic (unpaid) results in Google SERP.
These are actions on the technical part as well as on the content, internal and external link building, research of competitors and many other things.
And why is it important for us to rank a site in the top positions in the organic results pages of Google, Bing and other search engines?
The answer is that the further we go in the free results, the more likely we are to target targeted traffic to our site.
With a well-structured site, with quality content, useful internal and external links, this same traffic will perform more conversions (purchases, reservations, sales).
This is the reason that all serious businesses that sell goods and services online rely on search engine optimization or in-house teams, or external SEO agencies such as blog7.