It`s the folk conception to the software part of living beings.
Just because software is immaterial they tend to make it a supernatural thing.
Remains to be explained if our software is a local thing full installed in every brain (hardware) or are running in a cloud (like internet) independent from local hardware.
I tend to think our minds (or spirit, software) runs in a cloud. Or at least some part of our software is in a cloud. And I don't think what we call identity can survive the death of hardware. Logically speaking you can't kill something immaterial, so in a sense our software/spirit/consciousness/mind is immortal. Probably in a near future we will be able to not be so dependable in a so fragile hardware, I think we will be able to transfer our softaware from a biological hardware to non biological substrates/hardware. Then we will know a lot more about our software. We are already walking this path with the Blue Brain Project, see the OpenWorm Project too.