(in progress)

A service is the F4 nomenclature for a "component" or "plugin". It is a chunk of code that provides a service for the rest of the engine to use, hence the name. Services may be written in either C++ or script. Nearly everything in F4 is a service.

A package is a collection of services. C++ services are packaged into a DLL, script services are packaged into a directory (or, eventually, a .ZIP archive).