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Sree SalesforceSree Salesforce 

what is the difference between rerender and action region

Stop spamming with your interview questions
Rajesh PotnuruRajesh Potnuru
Hi Sri,

reRender - ID. Particular block will be refreshed.

Action Region: An area of a Visualforce page that demarcates which components should be processed by the server when an AJAX request is generated. Only the components in the body of the <apex:actionRegion> are processed by the server, thereby increasing the performance of the page.

Thanks & Regards,
Rajesh Potnuru

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Ankit AroraAnkit Arora
For action region :

For rendering hope these will help :