  The population of millisecond pulsars (MSPs) has been expanded considerably
in the last decade. Not only is their number increasing, but also various
classes of them have been revealed. Among different classes of MSPs, the
behaviour of black widows and redbacks are particularly interesting. These
systems consist of an MSP and a low-mass companion star in compact binaries
with an orbital period of less than a day. In this article, we give an overview
of the high energy nature of these two classes of MSPs. Updated catalogues of
black widows and redbacks are presented and their X ray/$\gamma$-ray properties
are reviewed. Besides the overview, using the most updated eight-year Fermi
Large Area Telescope point source catalog, we have compared the $\gamma$-ray
properties of these two MSP classes. The results suggest that the X-rays and
$\gamma$-rays observed from these MSPs originate from different mechanisms.
Lastly, we will also mention the future prospects of studying these spider
pulsars with the novel methodologies as well as upcoming observing facilities.
