what is sea

A sea is a large body of saltwater that is smaller than an ocean and is partially enclosed by land. Seas often connect to oceans and serve as important regions for trade, travel, and ecological diversity. They can be located along coastlines or entirely surrounded by land, in which case they are known as inland seas, like the Caspian Sea. Seas are crucial for Earth’s hydrological cycle and support a wide range of marine life, contributing significantly to local and global ecosystems. They also play important roles in climate regulation, cultural activities, and economies across the world.