Isolated Neutron Stars

Non-accreting neutron stars display diverse characteristics, leading us to classify them into several groups. This chapter is an observational driven review in which we survey the properties of the different classes of isolated neutron stars: from the “normal” rotation-powered pulsars to magnetars, the most magnetic neutron stars in the Universe we know of, from central compact objects (sometimes called also anti-magnetars) in supernova remnants to the X-ray dim isolated neutron stars. We also highlight a few sources that have exhibited features straddling those of different sub-groups, blurring the apparent diversity of the neutron star zoo and pointing to a gran unification.