Micro frontends extend microservices principles to frontend development. Each micro frontend is an independent unit with its own UI, logic, and deployment. Module federation in Webpack 5 enables sharing code at runtime. Single-spa framework orchestrates multiple micro frontends in one application. Router-based integration uses different URLs for different applications. iFrame integration provides strong isolation but poor UX. Web Components provide framework-agnostic component integration. CI/CD pipelines become independent per micro frontend. Teams own their micro frontend end-to-end. Shared libraries require careful version management to avoid duplication. Cross-cutting concerns like authentication and theming need centralized handling. Performance overhead of loading multiple frameworks must be considered. Common communication patterns include custom events and shared stores. Design systems ensure consistent UI across micro frontends. Poly-repo vs affect development workflow. Micro frontends are ideal for large applications with multiple teams. They enable incremental migration from legacy systems. Consider team structure and application complexity before adopting micro frontends.