Water types refer to the different categories of water based on their chemical composition and physical properties. The most common types include freshwater, saltwater, and brackish water. Freshwater is found in rivers, lakes, and glaciers, while saltwater is primarily found in oceans. Brackish water is a mix of both, typically found in estuaries where freshwater meets saltwater. Each water type supports different ecosystems and organisms. For example, freshwater habitats are home to species like trout and frogs, while saltwater environments support marine life such as sharks and coral reefs. Understanding these water types is essential for conservation and management efforts.