Although both techniques are helpful to rank the keywords and get traffic from the search engines, in the case of PPC advertisers pay for the traffic and get instant top 3 results even on top competitors and highly traffic generated keywords. SEO on the other hand is a different practice entirely. SEO means structuring, writing, and optimizing website pages to please search engine algorithms in order to improve organic search traffic. SEO takes a long time, and there is no exact estimated time to get a search engine ranking.