App and Services are Deployments can be deployed on the platform
You describe a desired state of the application in a Deployment
The Desired state of an application includes multiple states including Apps, Builders and Network
Nife deals with Stateless Applications and Edge Native Applications
A stateless app does not save data generated in one session for use in the next session with that client. Each execution is carried out as if it was the first time and responses are not dependent upon data from a previous execute and state. In contrast, a stateful application saves data about each client session and uses that data the next time the client makes a request.
Creating a deployment