LiveAdmin is an admin UI library for Phoenix applications built on Phoenix LiveView and Ecto. It provides a customizable administrative interface for managing application data with features like resource-based views (index, show, create, edit), custom actions and tasks, multi-tenancy support via Ecto prefixes, persistent user sessions, notifications via Phoenix.PubSub, and internationalization via Gettext. The architecture follows a modular design with clear separation of concerns between routing, resource management, components, and session handling. Key entry points include the LiveAdmin.Router.live_admin/3 macro for defining admin routes and LiveAdmin.Resource.__using__/1 for defining admin resources. The system relies on external dependencies including Phoenix, Phoenix LiveView, Ecto, Gettext, and Nimble Options for configuration validation.