Organic search results are the natural web page listings that show up when a user types a query in the search engine. Organic search results closely match with the user's search query based on relevance and usually show up when a page ranks naturally high in Google results because of SEO. Paid results are mostly ads. Paid results appear as ads at top or bottom of a page, and are based on pay per click campaign. The right combination of both the techniques can help get significant traffic to a website.