SEO writing is Search Engine Optimization writing. It is writing that is focused on grabbing the attention of the search engines using specific, targeted words or phrases (called keywords or keyword phrases), and using them in specific ways.
In my opinion seo is the best remarketing options for all the business because it's costing is vary and based on your selection of plan and your expectation. Other way of online marketing like affiliate marketing, PPC, video advertising or banner ads can cost you much and provide you limited time benefits but seo is for long term.