Since the discovery of the first fast radio burst (FRB) in 2007, and their confirmation as an abundant extragalactic population in 2013, the study of these sources has expanded at an incredible rate. In our 2019 review on the subject, we presented a growing, but still mysterious, population of FRBs—60 unique sources, 2 repeating FRBs, and only 1 identified host galaxy. However, in only a few short years, new observations and discoveries have given us a wealth of information about these sources. The total FRB population now stands at over 600 published sources, 24 repeaters, and 19 host galaxies. Higher time resolution data, sustained monitoring, and precision localisations have given us insight into repeaters, host galaxies, burst morphology, source activity, progenitor models, and the use of FRBs as cosmological probes. The recent detection of a bright FRB-like burst from the Galactic magnetar SGR 1935 + 2154 provides an important link between FRBs and magnetars. There also continue to be surprising discoveries, like periodic modulation of activity from repeaters and the localisation of one FRB source to a relatively nearby globular cluster associated with the M81 galaxy. In this review, we summarise the exciting observational results from the past few years. We also highlight their impact on our understanding of the FRB population and proposed progenitor models. We build on the introduction to FRBs in our earlier review, update our readers on recent results, and discuss interesting avenues for exploration as the field enters a new regime where hundreds to thousands of new FRBs will be discovered and reported each year.

自 2007 年发现第一个快速射电暴 (FRB) 以及 2013 年确认它们是丰富的河外星系以来，对这些源的研究以令人难以置信的速度扩大。在 2019 年对该主题的回顾中，我们提出了不断增长但仍然神秘的 FRB 群体——60 个独特的来源、2 个重复的 FRB 和仅 1 个已识别的宿主星系。然而，在短短几年内，新的观察和发现为我们提供了有关这些来源的大量信息。目前，FRB 总数已超过 600 个已发布的源、24 个中继器和 19 个宿主星系。更高的时间分辨率数据、持续监测和精确定位使我们能够深入了解中继器、宿主星系、爆发形态、源活动、前身模型以及快速射电暴作为宇宙学探测器的用途。最近从银河磁星 SGR 1935 + 2154 检测到的明亮的类似 FRB 的爆发提供了 FRB 和磁星之间的重要联系。还有一些令人惊讶的发现，例如中继器活动的周期性调制以及将一个 FRB 源定位到与 M81 星系相关的相对较近的球状星团。在这篇综述中，我们总结了过去几年令人兴奋的观察结果。我们还强调了它们对我们理解 FRB 群体和提出的祖先模型的影响。我们以之前的评论中对快速射电暴的介绍为基础，向读者介绍最新的结果，并讨论随着该领域进入一个新的领域，每年都会发现和报告数百到数千个新的快速射电暴的有趣的探索途径。