A review is made of the new theoretical and experimental results on multiple light-scattering near the critical point. Particular attention is paid to the effects of multiple scattering on the integrated intensity, depolarization, and spectrum of the critical opalescence. The features of the temperature, density, and angular dependence of these characteristics are considered for the cases of double and multiple scattering. It is shown the geometry is an important factor in critical opalescence. A study is made of the conditions under which the Born (Rayleigh) concept of scattering order loses meaning. A detailed comparison of theory and experiment is made for the problem of multiple light-scattering in critical opalescence.