Description
In the last twenty years, the study of ultra-fast outflows (UFOs) in AGNs has been recognized as a fundamental topic to be tackled in order to understand how the SMBH shaped the evolution of their host galaxies across cosmic times. Here I will focus on some basic aspects of our current knowledge of the astrophysics of the phenomenon with a comparison of what we learned from RQ and from RL objects. Finally I'll present some new theoretical results that indicate how the exploitation of new high resolution X-ray telescopes capability may help us in determining the launching mechanism of such winds.
