Idealism takes many forms: Berkeley’s claim that to be is to be perceived, Kant’s transcendental idealism, the absolute idealism of Hegel, and the Yogācāra doctrine of mind only. What they share is the conviction that mind is not a late product of matter but is in some way prior to or constitutive of the world.
Idealism
The view that reality is fundamentally mental or spiritual, or known only as it appears to mind.