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The Angular Guards are interfaces that tell the router if it allows or not the user to go a given URL.
To make that decision, Angular relies on a class implementing the Guards interface and outputs true or false.
There are five kinds of Guards:
- CanActivate: This Guard is called for each access request, and allow or forbid the access to the user.
- CanActivateChild: Same as previous one, but for child routes.
- CanDeactivate: This Guard is called each time a user wishes to leave the current route (for saving a form data when a user leaves early).
- CanLoad: This Guard checks if a user can access a lazily loaded module route.
- Resolve: This Guard allows to fetch some data before going to a given route.
