This publication is part of the research series“Resonance-Based Subspace Dynamics”. The series investigates how fundamental physical phenomena(particles, interactions, fields, and stability)can be understood as emergent resonance and mode structureswithin a geometrically structured subspace. This publication presents a conceptual and interpretative frameworkfor understanding electromagnetism as an emergent phenomenonof resonance-based subspace dynamics. It is intended for researchers in physics seeking a structuraland geometric perspective on electromagnetic phenomenabeyond point-particle and traditional field descriptions. The focus of this contribution is on interpreting electric charge,magnetic effects, and electromagnetic waves as stable modes,phase relations, and geometric couplings within a high-dimensional subspace,providing a deeper ontological understanding while preservingthe validity of Maxwell’s equations. The abstract of this contribution is given below: This publication presents a conceptual and interpretative framework in which electromagnetism is described as an emergent phenomenon of resonance-based subspace dynamics. Electric charge, magnetic effects, and electromagnetic waves are interpreted as stable modes, phase relations, and geometric couplings within a structured subspace of higher dimensionality. Maxwell’s equations remain fully valid and are understood here as an effective boundary description of these deeper modal structures. The work does not propose a replacement of established electromagnetic theory, but aims to provide an ontological and geometric depth interpretation that may help clarify why the electromagnetic interaction exhibits its characteristic structure and symmetries. This publication builds on the foundational concepts introduced in the preceding parts of the series, linking geometric modes, resonance, and subspace dynamics to electromagnetic phenomena, and provides a conceptual bridge to Part 5, which explores experimental modeling and applications.