I will review current observational and modelling results on neutron stars with strong magnetic fields (aka magnetars): in particular their outburst activity, their predicted evolution, birth and possible connection with GRBs and SLSNe. Furthermore, I will present new discoveries that strengthen somehow the relation between magnetars and other neutron star classes, and that argue on the ubiquitous presence of strong field non-dipolar component in possibly any young neutron star.