This book is a single binding account covering all the major aspects of oceanography. Arthur C. Clarke once said, "How inappropriate to call this planet Earth when it is quite clearly Ocean". The origin of life stems from the oceans and the entire diversity of life across the world is modulated by marine and oceanic processes. All the processes ranging from micro-scale, like coastal processes, to macro-scale, like those in the seas, the oceans and the marine life, play a vital role in maintaining the equilibrium of this planet, both from chemical as well as physical viewpoints. Since the beginning of time, the exploration and discovery of world's oceans has brought advancements and immense knowledge to humankind. The metaphors of Jason and Ulysses represent the cultural progress achieved through these discoveries and explorations. Contemporary oceanographic research portrays one of the most crucial frontiers of knowledge about Earth, depending on the exploration of oceans. Therefore, it is closely related to the advancement of novel technologies. Additionally, other social and scientific disciplines can also contribute several basic inputs for a conclusive elucidation of the complete ocean ecosystem. Therefore, this book will greatly help the readers to learn better ways to preserve the Blue Planet: Our Earth.