The Poynting vector, represented by the equation $$\mathbf{s} = \mathbf{E} \times \mathbf{H}$$, describes the directional energy flux or power flow per unit area of an electromagnetic field. This vector is critical in understanding how electromagnetic energy propagates through space, linking the electric field $$\mathbf{E}$$ and the magnetic field $$\mathbf{H}$$. The direction of the Poynting vector indicates the direction in which energy is transmitted, while its magnitude quantifies the amount of energy flowing through a unit area.
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