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Using adaptive mesh-refinement cosmological hydrodynamic simulations with aphysically motivated supernova feedback prescription we show that the standardcold dark matter model can account for extant observed properties of dampedLyman alpha systems (DLAs). We then examine the properties of DLA hostgalaxies. We find: (1) While DLA hosts roughly trace the overall population ofgalaxies at all redshifts, they are always gas rich. (2) The history of DLAevolution reflects primarily the evolution of the underlying cosmic density,galaxy size and galaxy interactions. With higher density and more interactionsat high redshift DLAs are larger in both absolute terms and in relative termswith respect to virial radii of halos. (3) The variety of DLAs at high redshiftis richer with a large contribution coming from galactic filaments, createdthrough close galaxy interactions. The portion of gaseous disks of galaxieswhere most stars reside makes relatively small contribution to DLA incidence atz=3-4. (4) The vast majority of DLAs arise in halos of mass M_h=10^10-10^12Msun at z=1.6-4. At z=3-4, 20-30% of DLA hosts are Lyman Break Galaxies (LBGs).(5) Galactic winds play an indispensable role in shaping the kinematicproperties of DLAs. Specifically, the high velocity width DLAs are a mixture ofthose arising in high mass, high velocity dispersion halos and those arising insmaller mass systems where cold gas clouds are entrained to high velocities bygalactic winds. (6) In agreement with observations, we see a weak butnoticeable evolution in DLA metallicity. The metallicity distribution centersat [Z/H]=-1.5 to -1 at z=3-4, with the peak moving to [Z/H]=-0.75 at z=1.6 and[Z/H]=-0.5 by z=0. (7) The star formation rate of DLA hosts is concentrated inthe range 0.3-30Msun/yr at z=3-4, gradually shifting lower to peak at ~0.5-1Msun/yr by z=0.

The Nature of Damped Lyman Alpha Systems and Their Hosts in the Standard Cold Dark Matter Universe