A REST API breaks down a transaction to create a series of small modules. Each module addresses a particular underlying part of the transaction. This modularity provide developers with a lot of flexibility, but it can be challenging for developers to design from scratch. Currently, Sample use cases for APP Runtime API are Mobile App and Custom App.
Mobile App. Mobile App is an application which communicates with server and mobile over the internet by using REST API.
Example Login Mobile App
Features like Key-in Username & Password, Log on with all case, Forgot Password, Remind me later are all actions from mobile to Server which communicate through internet by REST API.
Custom App.
Custom App is application which communicate with server and web application by using REST API.
Example Work Order
Create Order Item, Search Contact, View Order, Calculate Order and so on is action by User to communicate with Server by Rest API from Custom App.