The primary characteristic of freshwater ecosystems is their containment of water with low concentrations of dissolved salts, distinguishing them from marine systems. Freshwater ecosystems, including rivers, lakes, and wetlands, are crucial for supporting diverse plant and animal life. They provide essential ecosystem services, such as drinking water supply, habitat for wildlife, and flood control. Freshwater biodiversity is vital for maintaining ecological balance, and protecting these ecosystems is essential for sustaining clean water sources and ensuring the health of both human populations and the environment.