D&D General How does magic work in D&D (In-Universe/Lorewise)?

[Crimson Longinus]

As for patrons versus gods the implication of arcane magic versus divine is that patrons and their pacts are doing something different from gods and divine spirits. It therefore would not be that the divine is just stuff coming from a spirit or god. Either tapping a different source of power or channeling it differently, or something else. So Asmodeus as God and Archdevil can offer both slightly different types of power and have clerics and warlocks, while most gods are just divine types.

But how it is different and why? There really is no answer to those.