Hello @Pratiksha_45 

Greetings!

there is not much documentation on that. 

I guess it's kind of categorization under HR where we can define HR systems like concur, referral portal or SAP like systems. 

refer the below doc:

https://docs.servicenow.com/bundle/utah-employee-service-management/page/product/human-resources/con...

https://docs.servicenow.com/en-US/bundle/utah-employee-service-management/page/product/human-resourc...

Please mark my answer correct and helpful if it helps you

Kind Regards,

Ravi Chandra.