Water-soluble flux is a type of chemical compound used in soldering and welding processes. It helps to clean and prepare metal surfaces by removing oxidation and impurities, ensuring a strong bond between the materials. This flux is designed to dissolve in water, making it easy to clean off after the soldering process is complete. Unlike traditional fluxes, which may leave residues that can corrode metals over time, water-soluble flux can be rinsed away with water. This property makes it a popular choice in electronics and other applications where cleanliness is crucial for performance and longevity.