Freshwater streams are flowing bodies of water that are not salty, making them essential for many forms of life. They can be found in various environments, from mountains to plains, and they often originate from springs or melting snow. These streams provide habitats for a variety of organisms, including fish like trout and salmon, as well as plants and insects. The water in freshwater streams is constantly moving, which helps to keep it clean and oxygen-rich. This movement supports ecosystems and allows for the natural filtration of pollutants. Streams also play a crucial role in the water cycle, connecting to larger bodies of water like rivers and lakes.