Why manufacturer sometimes use pariticular AGND and PGND for DC/DC?

Hi everyone,

Sometimes I see separate AGND and PGND in DC/DC converters. But I don't understand how to connect them at the PCB level. I would appreciate it if you don't just tell me to check the manufacturer's documentation—I always do that.

I just want to understand if everyone knows/understands the advantage of having separate AGND and PGND. And how to connect them at the PCB level?

w/o

AGND

https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MPM3811GG-Z/?srsltid=AfmBOookF4rTW-Cev4suQY-0b8prv1BsC_usN-_Mg8VFNHBYDLx4vN_h

AGND

https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/NB685GQ/document_id/4378/

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