Search Engine Marketing (SEM) is methodology to rank your website on Google’s first page. Here you will pay some charges to google for ranking your website.. Here strategy is; The higher you pay, top most location you’ll get. Google will not only rank your website based on the charges you are paying but also the website’s quality score. Quality score depends on various factors such as CTR (Click Through Rate), relevancy of keyword, relevancy of content and most importantly quality of your landing page.