Presentational components in Angular serve two purposes: presenting application state and handling user interactions. They communicate via input/output properties forming a data binding API, and can be stateless or stateful with local UI state. The post covers converting mixed components into pure presentational components by extracting container components, declaring data binding APIs, minimizing template logic, using reactive forms to move validation into the component model, and applying the OnPush change detection strategy for performance. It also discusses the Model-View-Presenter pattern, testing strategies, and characteristics like purity, reusability, and deterministic rendering.
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