The percentage of people who can purchase products on its site on the company Web site visitors and conversion rate, or register as a member. An important indicator in measuring Web site return on investment. And also sell services to e-commerce (e-commerce) site, no matter how many visitors actually because the product doesn’t make sense. Buys a goods all visitors are 0% conversion rate is to indicate how much they actually purchased products out of the number of visitors, visitors who have to buy products and 100% will be. Are also available, such as to verify the effectiveness of advertising allows to calculate conversion rates for who clicks an ad for site visitors a simple percentage as well.