eCommerce platforms are software applications that help businesses sell products online. These platforms typically connect sellers with buyers, handle product catalog management, and provide analytics tools to monitor performance. Popular eCommerce platforms include Shopify, Big commerce, Volusion, and Magento. Many eCommerce platforms are free to use and offer basic functionality. Premium versions of these platforms can cost several hundred dollars per month but may offer more advanced features, including inventory management and fulfillment services.