Seas are large bodies of saltwater that are smaller than oceans and are partially enclosed by land. They play a crucial role in the Earth's climate and weather patterns, as well as serving as vital habitats for a diverse range of marine life, including fish, mammals, and plants. Examples of notable seas include the Mediterranean Sea and the Caribbean Sea. Seas are also important for human activities such as fishing, shipping, and tourism. They provide resources and recreational opportunities, making them essential for many coastal communities. Protecting these ecosystems is vital for maintaining biodiversity and supporting livelihoods around the world.