How does magic work in Egypt in Exodus?

Moses throws down his rod and it transforms into a serpent, to which the pharaoh has his "sorcerers" replicate the miracle, among others. I've seen some discussion on this and that magic was a real power they had is a common take, and does fit the best imo.

The best explanation of this magic seems to be "occultism", but I don't understand what that means exactly in this setting. And I'm confused regardless of how they channeled this power, what domain/source is it coming from? Any good insight into the nature of what magic they could have been doing there? Is that magic "divine" in nature or something else, as if it is "divine" then what's the connection link from God to the Egyptians using it?