The term 'The Ebb and Flow' is a poetic phrase used to describe the rise and fall of the tides. Tides are caused by the gravitational pull of the moon and sun on the Earth's oceans, resulting in a regular pattern of high and low tides. The ebb and flow of the tides is an important part of the marine ecosystem, providing nutrients to coastal areas and influencing the behavior of many species of fish and other marine life.