Before diving into the Power Apps..and walkthroughs..lets see the different Power Apps variants…we have two different kinds of Power Apps. available which are developed based on needs, data sources available and their advantages in the design.
1.Canvas Apps:
These Apps. are developed on Canvas without writing any code with the usual language namely C#. These are developed by just dragging the respective components on to the Canvas. However just should be aware of basic excel functions in order to develop apps with ease. We can connect to Microsoft & Non Microsoft Data sources where we do have design control, need to create separate apps for mobile devices and web browsers. These are task focused and used frequently for creating simple apps.
These are built using Dynamics 365 framework and uses CDS Connectors. Model-driven app design is a component-focused approach to app development and can be used to develop apps covering complex scenarios. The design is automatically by the components we add to the App. To use model driven apps or for creating CDS for apps, we need Power Apps P2 License having access to Data. Moreover the model driven apps can be distributed as a solution. If we speak about model driven app. components, these are divided into data, UI, logic, and visualization categories.
The data talks about on which data the app. was built, UI defines how the users will interact with the App. While the logic determines the business processes, rules, and automation the app will have..
Cheers,
PMDY
ECELLORS CRM Blog 
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