Bottom Tab Navigator: Core Mobile Navigation
A Bottom Tab Navigator is the classic mobile UI for switching between top-level app sections. It lazily loads screens, mounting them only when first focused to save memory. Use it for primary navigation.
A Bottom Tab Navigator provides the classic mobile UI for switching between a few top-level app sections. It improves initial load time and saves memory by lazily initializing routes—screen components are not mounted until they are first focused. This is the standard choice for primary app navigation, such as switching between a Home feed, a Search page, and a User Profile. The default `backBehavior` is `firstRoute`, meaning the back button returns to the first tab, not the previously visited one, which can surprise users.
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