Search engine optimization (SEO) is the practice of increasing the quantity and quality of traffic to your website through organic search engine results.
When someone searches for some particular product or website on search engines like yahoo, Google etc. there are some websites which show up. The web links appear from the first page to the last with respect to their popularity and relevancy with your keywords in the search bar. The web pages falling on the initial 2 to 3 pages are considered more popular and are most likely to be visited. The subsequent pages are not that much reached by people