Resonant absorption occurs when a wave propagates through a material at a frequency matching the material's natural frequency, leading to energy attenuation. This energy can be absorbed by the material or scattered in different directions. In the context of collisionless plasma, this phenomenon is specifically referred to as Landau Attenuation or Landau Damping, which describes the attenuation of waves in such environments. For further details, refer to the Wikipedia article on Landau damping.
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