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What is the purpose of the forRoot() and forChild() methods in Angular?

Used mainly by feature modules that provide services and routes.
forRoot() configures and provides singleton services for the app. Usually called

in the root module.

forChild() configures child routes without providing new service instances.

Example:

RouterModule.forRoot(routes) // for root app routing

RouterModule.forChild(childRoutes) // for feature module routing

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