What are spirits' and demons'?

What are spirits' and demons'?

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Spirits can be human spirits. These are souls, which for whatever reason, haven't moved on and are stuck here. Demons and angels are just dark and light spirits. You also get other types of spirits like elementals which varies. You get varying degrees of dark and light spirits. For example, a spirit guide that helps in this kind of work to move other spirits on, would be a different form of light spirit to an angel. A parasitic spirit, just causing a disease in somebody, would be a lesser form of a dark spirit, like a demon.