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With the custom component in the power apps, it makes the app makers easy to share an update one or more components with other makers.
A component library is a centralized and repository of components for usability.
The below video shows, an example of creating a custom component called emotional rating component. Which can be used, across all the apps to rate a particular product.
Model driven app cannot conenct with any other datasource except Dataverse unless we use any Power Automate in the middle to store the data in the Dataverse. In such scenario, we may need to develop a Canvas app to connect directly with the connectors and use them to embed in the MDA.
Please follow the below steps in the video to embed the app in MDA
Please see the below video to know , why we need custom connector in Power Platform and how to create a custom connector
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