Purpose of the service layer

Question

Am I correct in thinking that the purpose of a service layer includes the following?

• thinning out of domain models (i.e. movement of certain functions like in cach

Answer 1

Service Layer as the name suggests provides services that are not directly responsibility of any other domain object.

Service Layer also helps in decoupling of responsibilities. Service Layer forms the middle part between Database/persistence layer and the Client/UI/Web layer.

Properly designing the Service Layer allows it to be used from any client be it a Web Client or a Web Service (SOA) or Mobile device.