Organic SEO focus on non paid tactics of optimization including both on page & off page. While Inorganic SEO focus on paid tactics like adword etc. to get instant traffic.
Traffic Apart from Seo activities you can promote your website/product on social networking sites like facebook, twitter, linkedin etc.
Do work Off page activity like article submission, Social Bookmarking, Press release its really helpful to increase traffic for your website....
organic seo means do only what google loves...don't do seo activity which google hates to get high ranking.
To get more traffic you can try google adwords, forum posting, directory submission, free advertisement listing site etc.
organic section is the free section of the search which constitute of the following; An SEO consist of the following Keyword Research: choosing the appropriate keyword to improve the ranking of your page Directory submission: Back linking for a website Blog writing & posting: Informal content writing containing inbound links to other sites with in anchor text which also includes graphics, audio and video. Article writing & positing: Formal content writing containing inbound links to other sites with in anchor text. Social bench marking: Back linking on a public website such as Digg, Del.icio.us etc Social book marking: Promoting the web site on social networking sites such as Face book, twitter etc etc etc while inorganic section is the paid section of the search mostly highlighted on top or right top corner of search pages. it consist of full fledge SEO tactics and also includes; paid inclusion: Its a practice of paying a search engine to add a site to its database immediately rather then setting up the site so that the search engine spider would find it on its own Traditional ads this includes placing paid ads on search engine result pages Pay Per Click (PPC) advertising: its completely text only in which user defines which keyword should be brought up by the ad. Etc etc