As per SEO Expert Neil Patel SEO is the process of optimizing your online content so that a search engine likes to show it as a top result for searches of a certain keyword. I would like to say that it is optimization of website content as per the guidelines of the search engines like Google, Bing, Yahoo, etc. As search engines are getting smarter day by day, you need to know what factors are influencing the ranking and performance of your website.
In this blog, some of the factors are analysed which influence the ranking and visibility of your website. You should visit the URL to know more about the factors -http://www.contentparagon.com/analysis-critical-factors-influencing-seo/