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I am reading Conroy et al. (2013), an extensive review on Stellar Population Synthesis technique, and I really can't get the difference between Composite Stellar Population and Spectral Energy Distribution of a galaxy. The first seems to be luminosity per unit wavelength resulting from the sum of all simple stellar population, considering the effect of dust and a star formation history, the second is the luminosity or the flux per unit wavelength coming from a galaxy.

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    $\begingroup$ The spectrum, and hence the SED, of a galaxy includes light not only from its stellar population, but also other processes such as synchrotron radiation and dust emission. $\endgroup$
    – pela
    Jan 17 at 23:27

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