E-commerce (electronic commerce) is the online buying and selling of goods and services, involving digital transactions, payments, and data transfer over the internet via websites, apps, or marketplaces like Amazon and eBay. It includes everything from browsing to payment and delivery, replacing or complementing traditional brick-and-mortar stores and allowing for business-to-business (B2B), business-to-consumer (B2C), and consumer-to-consumer (C2C) models