This book introduces various, easily understandable examples of fluids encountered in daily life. It describes the characteristics of these fluids, starting from a cup of coffee, a familiar small-scale fluid, to the vast ocean—one of the largest-scale fluids on Earth. Understanding the principles of fluids and their motion has long been complex and challenging. However, grasping these fundamentals opens doors to deeper exploration and discovery. This book engages middle and high school students, undergraduates, and curious readers in exploring the ocean’s vast possibilities. Cartoons and simple language make the concepts more accessible, helping readers not only understand fluids but also gain valuable safety insights related to the ocean.