It should be noted that since, some developers seek to get rid of the "server side", some applications are built around synchronizing their storage in the "cloud". That is, in fact, they have the same two-link system, but with the transfer of its deployment architecture to the operating system level. In some cases, such a structure is justified, but such a system is not so easily scaled, and its capabilities are very limited. General structure of the server application
https://www.leadconcept.com/client-s...velopment.html At the most primitive level of abstraction, a server-oriented application consists of the following architectural layers: The core of the application, which includes system components that are not available for user interaction. Graphical user interface Reusable components: libraries, visual components and more. Environment files: AppDelegate, .plist, etc. Application resources: graphic files, sounds, necessary binary files.