The primary sectors within eCommerce can be broadly categorized into: a) Business-to-Consumer (B2C): Online transactions between companies and individual consumers. b) Business-to-Business (B2B): Transactions conducted online between two businesses. c) Consumer-to-Consumer (C2C): Peer-to-peer sales facilitated through an online platform. d) Consumer-to-Business (C2B): Individuals offering products or services to businesses via digital platforms.