We present a comparison of the properties of galaxies in the most
underdense regions of the Universe, where the galaxy number density is
less than 10% of the mean density, with galaxies from more typical regions.
We have compiled a sample of galaxies in 46 large nearby voids that
were identified using the Sloan Digital Sky Survey DR4, which provides
the largest coverage of the sky. We study the u-r color distribution,
morphology, specific star formation rate, and radial number density profiles
for a total of 495 galaxies fainter than M_r=-20.4 +5 log h
located inside the voids and compare these properties with a control
sample of field galaxies. We show that there is an excess
of blue galaxies inside the voids. However, inspecting the properties
of blue and red galaxies separately, we find that galaxy properties
such as color distribution, bulge-to-total ratios, and concentrations
are remarkably similar between the void and overall sample. The void
galaxies also show the same specific star formation rate at fixed color as
the control galaxies. We compare our results with the predictions of
cosmological simulations of galaxy formation using the Millennium Run
semi-analytic galaxy catalog. We show that the properties of the
simulated galaxies in large voids are in reasonably good agreement
with those found in similar environments in the real Universe. To
summarize, in spite of the fact that galaxies in voids live in the
least dense large-scale environment, this environment makes very little
impact on properties of galaxies.