What are the most important features that make Magento a good platform for eCommerce?

• It is 100% free, but still has lots of great features—more than most stores will ever use.
• It is integrated with dozens of payment gateways and shipping carriers, and it can be integrated with many other systems (ERP, CRM etc.) through extensions.
• It’s suitable for the sale of any type of product, from typical t-shirts and cellphones, to digital goods such as ebooks, music, and photos, and can even handle subscriptions.
• It also has tons of great premium extensions for any occasion.
• It is scalable—your store can grow with your company.
• It also has a paid version (Enterprise Edition) which offers professional technical support and other benefits. You can have confidence that as your store grows, you’ll be able to switch to the professional version when appropriate.