What theological concept describes Christ's dual nature as God and man?

The theological concept that describes Christ's dual nature as both fully God and fully man is known as the Hypostatic Union. This term refers to the doctrine that in the one person of Jesus Christ, there exists two distinct natures: one divine and one human. This union is essential to the Christian understanding of the Incarnation, emphasizing that Christ is truly God and truly human without mixing, altering, or diminishing either nature.

The importance of the Hypostatic Union lies in its implications for salvation, as it affirms that Jesus, being fully God, has the authority to forgive sins and grant eternal life, while being fully human allows Him to represent humanity in redemption. This doctrine is foundational to orthodox Christian beliefs and counteracts other views that might propose a different understanding of Christ's nature.

In contrast, Monophysitism asserts that there is only one nature in Christ, which either absorbs the other or alters it, thereby denying the full reality of both natures. Kenosis refers to the concept of Christ emptying Himself of certain divine attributes during His earthly ministry but does not directly define the dual nature itself. Arianism posits that Christ was a created being rather than fully God, which fundamentally undermines the concept of the Hypost