  There has been a recent resurgence of interest in the structure of the
gravitational field at null infinity, sparked by new results on soft charges
and infrared issues related to the S matrix theory in perturbative quantum
gravity. We summarize these developments and put them in the broader context of
research in the relativity community that dates back to several decades. In
keeping with intent of this series, this overview is addressed to gravitational
scientists who are not experts in this specific area.
