Tide refers to the regular rise and fall of sea levels caused by the gravitational pull of the Moon and the Sun. As the Earth rotates, different areas experience high and low tides, creating a rhythmic pattern that affects coastal regions. This phenomenon is essential for marine life and influences activities like fishing and boating. The strength of the tide can vary based on the alignment of the Moon and Sun, leading to spring tides, which are higher, and neap tides, which are lower. Understanding tides is crucial for navigation and helps in predicting weather patterns along coastlines.