Tides in the oceans and seas occur primarily due to the gravitational forces exerted by the Moon and the Sun, as well as the centrifugal force generated by the Earth's rotation. The Moon has the most significant impact because its gravitational pull creates bulges of water on the side of the Earth facing it, leading to high tides. Meanwhile, the Sun, although farther away, also contributes to tidal patterns, and the centrifugal force results from the Earth-Moon system's rotation around a common center of mass, contributing to the overall tidal effect. Understanding these forces provides insight into oceanic behaviors, which are crucial for environmental studies and navigation, relevant topics in UPSC Prelims GS Paper I.