It is by now well established that galaxy evolution is driven by intrinsic and environmental processes, both contributing to shape the observed properties of galaxies. A number of early studies have shown that the star formation activity of galaxies depends on their local density, and, on the theoretical side, models of galaxy evolution have indicated that galaxies residing in the same environment do not evolve similarly. Contrary to their central (most massive) galaxy of a group/cluster, satellite galaxies are stripped off their gas and stars, and have their star formation quenched by their environment. Large galaxy surveys like SDSS now permit us to investigate in detail environment-driven transformation processes by comparing centrals and satellites. In this talk I will summarize what we have so far learnt about environmental effects by analyzing the observed properties of central and satellite galaxies at z~0 in SDSS, as a function of their stellar mass and the dark matter mass of their host halo.