  I review the observational data most relevant for large scale structure.
These data determine the system of cosmological parameters: the Hubble
parameter, densities of various populations of the Universe, parameters
characterizing the power spectrum of matter, including the biasing parameter of
galaxies relative to matter. Recent data suggest that the overall matter/energy
density is approximately equal to the critical density, and most (0.6 - 0.7) of
the density is in the form of cosmological term or ``dark (vacuum) energy''.
The density of the matter is 0.3 - 0.4 (including hot and cold dark matter and
luminous matter), the upper limit of the density of the hot dark matter is
0.05, all in units of the critical cosmological density.
