The past few years have witnessed a rapid growth of research in the low frequency sector of gravitational waves. This is triggered by various motivations: First, its observable consequences known as “memory effects” may be detected in the near future in current and planned gravitational wave detectors. Second, substantial breakthroughs in the holographic understanding of gravity in asymptotically flat spacetimes, have revealed a deep connection between memory and the underlying symmetries of quantum gravity. Third, novel methods to study gravitational scattering amplitudes have revealed detailed information about their soft limit.