Fresnel Zone: Ellipsoids, Energy & Wavelengths

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Fresnel zones are linked to ellipsoids and represent areas where most of the energy transmitted by an antenna reaches another antenna. The width of these ellipsoids increases with the wavelength, which can lead to confusion about their significance. The ellipsoidal shape is essential for understanding how signals propagate and interact with obstacles. A rectangular shape would not accurately depict the energy distribution and signal behavior in wireless communication. For a clearer understanding, a recommended resource is provided that explains these concepts in detail.
unseensoul
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I know fresnel zone is related to ellipsoids but what are these about? I was told they represent most of the energy transmitted by an antenna to another antenna. However, this makes no sense to me. Apparently, the width of the ellipsoid increases if the wavelength does so as well which makes it even more confusing. What do these ellipsoids actually represent? Why not another shape such as a rectangle?
 
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