  This is a review talk on the UV and infrared selected galaxies. The central
question addressed is: do UV and infrared surveys see the 2 sides of star
formation of the same population, or star formation of 2 different populations?
We first review the literature on the UV and IR selected galaxy samples, try to
quantify the difference and overlaps between these two populations of star
forming galaxies. We then present some preliminary results of a GALEX/SWIRE
comparison study for IR and UV selected galaxies at z=0.6, in an attempt to
constrain the evolution of the dust attenuation and of stellar mass of these
galaxies.
