A

ultimate aim of atman (self) is to attain moksha (Brahman), then why atman got separated from Brahman initially?

First understand, drop of the ocean and ocean is separate?

Somehow, the drop of the ocean is separated from ocean, does it mean drop is not part of ocean?

Atma is the part of Brahman, it is never separated. It is sent by Brahman to Aatman in this world to experience the liberation from cycle of birth and death.

Why Brahman send Atman?

We have call this “Leela(A Play)