It is a known fact that Magento holds the maximum share for the eCommerce sites developed in its platform and it cannot without a strong reason. It is an open source online store development platform with very unique and robust features and functions that give the freedom to the developers and users to create a website as per their requirement.
Source: http://www.sooperarticles.com/internet-articles/web-development-articles/why-magento-considered-best-ecommerce-platform-1475718.html