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Whenever you are writing a book, people are bound to ask: ‘What kind of book is it?Who is it for?’ These questions are reasonable, but the answers may not be that obvious. You may, for example, have embarked on the project simply because it seemed like a good idea at the time. So, with this in mind, what kind of a book is this? Having lived with it for longer than I care to figure out, I still find it difficult to give a clear answer. It is much easier to explain what it is not. This book is not an exhaustive review of gravitationalwave astronomy. At least not in the sense that it provides a ‘complete’ reference list and a detailed account of the historical developments of the ideas and the scope of the field. It is much more ‘subjective’ than that. This may be frustrating to colleagues that have contributed to the developments over the last several decades, but the reality is that I had to make choices. It was simply not manageable to peek into (and report back on) every nook and cranny, no matter how fascinating this might have been. Instead, I have tried to provide an entry point to the vast (and rapidly growing!) literature on the different aspects of gravitational waves and related astrophysics. In essence, I have tried to build a bridge across different areas of physics that have fascinated me for a long time. On the one hand, we have gravity—with Einstein’s warped spacetime providing an astonishing example of what the human mind is capable of. On the other hand, there is the extraordinary range of astrophysics and cosmology that comes into play when we try to understand the gravitational-wave sky. And finally, we need to consider the sublime technology that was developed to catch these faint whispers from the distant Universe. This book maps out a journey through this complex landscape— introducing a combination of overlapping areas of research, many of which require their separate books for a fair treatment. The different chapters (especially in the second part) are intended to narrow the gap between a basic understanding and current research. An important part of this involves introducing the relevant language—making the involved concepts less ‘mysterious’.