Polyaspartic acid is a synthetic, biodegradable polymer derived from aspartic acid. It is a polyamide with a peptide-like backbone, structurally related to proteins, and is known for its water solubility and anionic character. It is commercially available in various forms, including sodium salts. Its primary industrial application is as a highly effective, environmentally friendly scale and corrosion inhibitor in water treatment systems, particularly for cooling water, boiler water, and desalination processes. It functions by chelating metal ions (like calcium and magnesium) and dispersing scale-forming particles, preventing their deposition. Due to its excellent biodegradability and low toxicity, it serves as a "green" alternative to traditional phosphonate-based inhibitors. Beyond water treatment, polyaspartic acid finds use as a superabsorbent polymer, in detergents as a builder, in agriculture as a nutrient carrier, and in personal care products for its mild conditioning properties. Its versatility stems from its biocompatibility, biodegradability, and ability to be chemically modified for specific functionalities.