Shopify is an e-commerce platform that allows users to create online stores for selling various products, utilizing a template language called Liquid for dynamic content. Key features of Shopify include easy product organization, payment processing, and customization, along with advantages such as fast launch times and robust app integrations, but it has disadvantages like limited customizability and service lock-in. Overall, it is favored by users migrating from other platforms due to its user-friendly features.