Some major issues concerning how galaxies formed have emerged during recent years. Massive 　galaxies formed earlier in an apparently anti-hierarchical way ("downsizing"). The growth of 　supermassive black holes (SMBH) through accretion appears to be related to that of stars in 　galaxies, still, it is commonly believed that active nuclei quenched star formation during 　the recent history of the Universe. Most of the black hole growth took place in obscured 　environments, such as star formation, we will see how deep infrared surveys, such as GOODS, 　the Great Observatories Origins Deep Survey, changed our vision of the history of dust 　obscured star formation and SMBH growth. One of the solutions proposed to explain the origin 　of the "downsizing" would be that the environment too acts stops the star formation activity 　in galaxies, we will address this issue thanks to the most complete spectroscopic sample of 　galaxies. The Herschel satellite is scheduled to be launched on April 12, 2009, hence very 　soon, we will briefly present its major extragalactic programs.