The primary differences between seas and oceans are size, location, and degree of enclosure:
Size: Oceans are significantly larger and deeper than seas, encompassing vast expanses of open water. Seas are generally smaller and shallower.
Location and Enclosure: Oceans are open bodies of water, interconnected and forming the Global Ocean. Seas are typically located where oceans meet land and are often partially or fully enclosed by land, such as the Mediterranean Sea or the Black Sea.
Geographical Role: Oceans define the major divisions of the Earth's hydrosphere (Pacific, Atlantic, Indian, Arctic, and Southern Oceans), while seas often play regional roles, serving as extensions or subdivisions of oceans.