Speaker
Description
In the past two decades tremendous progress has been made in the observation of jetted AGNs, thanks to a new generation of instruments, especially in X-rays and gamma-rays.
From population studies (going lower in luminosity, further in redshift, broader in SEDs and source types) to new phenomenology (ultra-fast variability, hard TeV spectra, changing-look AGNs, neutrinos association, X-ray polarization properties), we have now a much better grasp of the blazar phenomenon and jet properties, but still not a clear answer to most of the fundamental questions, such as: how and why some AGNs launch relativistic jets, what is the main particle acceleration and emission mechanism in the jet, where the emission comes from and even which type of particles produce the observed gamma-ray emission.
In this contribution I revisit some old and new issues in the context of the latest results, and discuss some perspectives for the next steps.