AI Fabric- DocumentUnderstanding Activity

Can anyone please explain the difference between MLSKill Activity and ML Extractor(need to use inside the Data Extractor Scope)?
which one is good to use to train the DU Models?

Attached the activity image for reference.
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Hi Visalakshi,

About the ML Services Activities Pack:

This activity pack features a set of activities allowing you to interact with AI Fabric. You can retrieve and call all ML Skills available on your tenant by using the ML Skill activity, as well as upload files by using the Upload File activity.

About the Document Understanding ML Activities Pack:

The Machine Learning Extractor activity enables the usage of UiPath provided machine learning models to perform data extraction from documents. The activity is capable of consuming ML models in the context of document understanding, thus enabling RPA workflows to use such models for data extraction from documents.