Water soluble fiber, also known as soluble dietary fiber, refers to a type of fiber that dissolves in water to form a gel-like substance. It is naturally found in various plants and is a critical component of human nutrition. In the industrial and manufacturing sectors, water soluble fibers refer to synthetic or semi-synthetic fibers that can dissolve in water under specific conditions, making them valuable in a range of applications such as textiles, composites, and environmental protection.