Klaytn is a blockchain platform that consists of three distinct subnetworks: the Core Cell Network (CCN), Endpoint Node Network (ENN), and Service Chain Network (SCN). The CCN is the main network that manages the consensus and transactions of the platform. The ENN is responsible for providing the interface between the CCN and the users. The SCN is a separate blockchain that allows users to create and deploy their own decentralized applications (dApps) on the Klaytn platform. Each subnetwork has its own specific roles and purposes, and together they provide a secure and reliable platform for users to transact and develop applications.