Common Data Service Developer Guide
Power Apps offers users, businesses, independent software vendors (ISVs), and systems integrators (SIs) a powerful platform for building line-of-business apps. Common Data Service is the underlying data platform for Power Apps that contains the core functionality such as server-side logic (plug-ins and workflows), business process flows, a highly sophisticated security model, and an extensible platform for developers to build apps.
There are many aspects to how developers can contribute to creating apps that use Common Data Service. While it is possible to build an application with code using Common Data Service as your data source, most projects will use either model-driven apps or canvas apps to generate the experience that people will use.
Working with model-driven apps
Model-driven apps are built on Common Data Service, and can only connect to a Common Data Service environment. All the data that defines a model-driven app is stored within Common Data Service.
Model-driven apps share the method of distributing customizations and extensions used by Common Data Service using Solutions.
Model driven apps also have a number of points for developers to write code to extend. For information on what developers can do with model-driven apps, see Model-driven apps Developer Guide.
Understand when to write code
Because Common Data Service includes many capabilities for people to configure custom business logic without writing code, the most common scenarios for developers to contribute involve filling spaces in-between where existing features may not provide functionality you need to meet a requirement. Fortunately, Common Data Service provides many points for developers to extend the common functionality using code.
For a developer who will contribute to projects it is important that they understand what can be done without writing code. You should familiarize yourself with these capabilities. More information: What is Common Data Service?
Content for on-premises deployments
Common Data Service is not available for on-premise deployments at this time. Content in this guide does not include information about options that are only available for on-premises or internet facing deployments (IFD). For information related to these options, see the Developer Guide for Dynamics 365 Customer Engagement (on-premises).