Twice each day, the ocean rises and falls along the world's coastlines, a rhythm set in motion by the gravitational pull of the Moon and Sun. This book explains how that pull acts on Earth's waters, why tides differ from one coast to another, and how the interplay of celestial bodies produces the patterns of spring and neap tides. Generated by artificial intelligence, the book offers a clear, structured introduction to the physics behind tidal motion, the role of Earth's rotation, and the influence of local geography on tidal ranges. You will also learn how tides are measured and predicted, and why they matter for navigation, ecosystems, and coastal life. Written for readers with no prior background in physics or oceanography, it presents these ideas in plain, accessible language.