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Angular NgModules and Components
Angular NgModules provide a compilation context for their components. A root NgModule always has a root component that is created during bootstrap, but any NgModule can include any number of additional components, which can be loaded through the router or created through the template. The components that belong to a NgModule share a compilation context.
A component and its template together define a view. A component can contain a view hierarchy, which allows you to define arbitrarily complex areas of the screen that can be created, modified, and destroyed as a unit. A view hierarchy can mix views defined in components that belong to different NgModules. This is often the case, especially for UI libraries.
When you create a component, it is associated directly with a single view, called the host view. The host view can be the root of a view hierarchy, which can contain embedded views, which are in turn the host views of other components. Those components can be in the same NgModule, or can be imported from other NgModules. Views in the tree can be nested to any depth.
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