Difference between AI Skill Document Extraction and Start Doc Extraction Smart Service

Certified Senior Developer

Hello

what is the difference between

- AI Skill Document Extraction = https://docs.appian.com/suite/help/23.2/create-skill-doc-extraction.html

- Start Doc Extraction Smart Service = https://docs.appian.com/suite/help/23.2/Start_Doc_Extraction_Smart_Service.html

?

Thanks 

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