The document summarizes the design and architecture of WSO2 Carbon 4.0.0 Kernel. It discusses how Carbon achieved modularity and dynamism through OSGi concepts, with everything compiled and run as bundles. This provided a solid foundation for a lean, modular, enterprise-class middleware platform. Carbon created a composable server architecture with products as sets of independently installable components running on the shared Carbon framework. It also discusses features like multi-tenancy, lazy loading of tenants, and a feature manager.