Organic SEO is non paid SEO method which takes more time to produce the result but it is long term. It works by focusing on content creation, link building, meta-tag optimization, keyword enhancement, etc. It is also called as natural SEO.
Inorganic SEO is paid SEO method which produce result in short period but are not effective for long term. It works by concentrating on search engine marketing which involves paid advertising, pay-per-click advertising as well as paid affiliate marketing.