How do Angular Guards work internally and what types exist?

Quick Answer Guards are services implementing guard interfaces. Angular Router calls them before activating/deactivating routes. CanActivate: blocks unauthenticated access. CanDeactivate: warns about unsaved changes. CanLoad: prevents lazy module download for unauthorized users (unlike CanActivate which loads the module then blocks). Resolve: fetches data before the route component initializes. Modern Angular uses functional guards (plain functions).

Answer

Guards run before route activation to allow or block navigation.

Types include: CanActivate, CanDeactivate, CanLoad, CanActivateChild, and Resolve.

They handle security, data preloading, navigation rules, and preventing access to invalid or unauthorized pages.

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How do Angular Guards work internally and what types exist?

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