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AFTAB ALI 6AFTAB ALI 6 

what is case assignment rule?

VinayVinay (Salesforce Developers) 
Hi Aftab,

Case assignment rules can assign cases regardless of how cases are created. Cases can be created manually or automatically using Web-to-Case, Email-to-Case, On-Demand Email-to-Case, the Self-Service portal, the Customer Portal, Outlook, or Lotus Notes.

https://trailhead.salesforce.com/content/learn/projects/set-up-case-escalation-entitlements/create-case-queues-assignment-rule
https://help.salesforce.com/s/articleView?id=sf.customize_leadrules.htm&type=5

Please mark as Best Answer if above information was helpful.

Thanks,