Leading e-commerce platforms such as Shopify, WooCommerce, Magento, BigCommerce, Wix eCommerce, Squarespace Commerce, PrestaShop, OpenCart, Salesforce Commerce Cloud, and SAP Commerce Cloud are widely used to build and scale online stores with capabilities like product management, secure payments, inventory control, and customer experience optimization. Key factors to evaluate include ease of use, customization flexibility, integrations (CRM/ERP), payment gateway support, performance, PCI-compliant security, scalability, and total cost of ownership. Platforms like Shopify, Wix, and Squarespace are easy to use and quick to deploy, WooCommerce and PrestaShop offer high customization and control, while Magento, Salesforce, and SAP deliver enterprise-grade scalability, automation, and global capabilities. Enterprise platforms provide advanced features, deep integrations, and high scalability but involve greater complexity and cost, whereas lightweight or open-source tools are more flexible, cost-effective, and easier to start with but may require more technical effort to scale and maintain.