This book deals with every aspect of oceanography in detail including various aspects of physical, chemical, geological, and biological discourse. Earth and Planetary Science is perhaps the oldest, dynamic, and ever-evolving subject. Oceanography is one of its domains, which has become important in the present date, given the ubiquitous and undeniable climate change that we are experiencing. The subject domain of oceanography encompasses several environmental issues, which need serious attention from the present scientific community. Despite the oceans significant role in the collective well-being of the human race, a multitude of anthropogenic activities has drastically polluted and degraded several crucial oceanic ecosystems within a short span. This book aims to present a concise yet succinct introduction to Oceanography as a subject and at the same time highlight the cutting-edge topics of research encompassing marine pollution, coastal processes, and many other associated phenomena. Oceanography is an interdisciplinary emerging subject and students all over the world who come from varied disciplines are pursuing it as higher studies. Long sections are devoted to oceanatmosphere interaction, tides, waves, and related coastal processes. The book represents a comprehensive idea of human activities bestowing the ocean with particular reference to Indian examples. This book helps to understand marine pollution and the behavior of oil, plastic, and other agents in the light of real-world examples and empirical models. Harnessing electricity from waves and tides is a technological advancement in the field of unconventional energy. The vast resources of the ocean like oil, mineral, methane hydrate, and their proper estimation and exploitation is the topic of discussion in the third part of the book. This book is designated to meet the essential needs of the students studying oceanography and marine science. It may be helpful to professional oceanographers also.