# Energy bands diagram in semiconductors

mendes
We usually plot the energy versus k, the wave vector, in the so-called "energy band diagram" for semiconductors. I am trying to understand the significance of "k" in this case. k is the wave vector, which means come kind of reciprocal of the space wavelength of the wave. But this definition does not make me understand the utility of plotting the energy versus k ! Does k mean something else also ?