Make a Service and use in multiple files.

1.Make service.
2.Add data in the service.
3.Make footer component.
4.Use service in app component
5.Use service in the footer component.

 

                                 1. Make a Service 

Syntax:  ng g service services/userdata

                2. Add data in the service

                          3.Make footer component.

Syntax:  ng g c footer