Well, who are you?
I want you to do me a favor. I want you to tell all your friends about me. I'm Beetlejuice!
Tell me in terms that are meaningful for you, and in ways that match your own worldview or understanding.
There is no wrong answer.
In all seriousness, I am a jiva or soul that has lived countless lifetimes. Further, I am ultimately Atman, itself Brahman. However, I am not yet self-realized about this, rather, it is something I know intellectually, but I have had a few "glimpses" that felt blissful and liberating.