What is SEO
In short
SEO, or search engine optimization, is the work that helps your site rank higher in Google search results and thereby bring in more visitors.
SEO has two sides. Technical SEO ensures Google can read and index the site: speed, structure, markup. Content SEO means content that answers what people search for.
SEO is not a one-time task. It is an ongoing process whose results come over time.
Why SEO matters
People search Google for services with a clear intent to buy. If your site is not there, they find a competitor. SEO brings organic traffic that does not stop when you stop paying.