Sodium lignosulfonate is an anionic polyelectrolyte polymer derived from lignin, a major component of wood. It is produced as a by-product of the sulfite pulping process for paper manufacturing. The compound consists of a complex, branched macromolecular structure containing sulfonate groups, phenolic hydroxyl groups, and methoxy groups, which confer its water solubility and surface-active properties. Its primary applications are as a versatile industrial dispersant, binder, and emulsifier. It is extensively used in the construction industry as a water-reducing admixture in concrete and plaster, improving workability and strength. In agriculture, it serves as a dispersant for pesticides and fertilizers, and as a soil conditioner. Other significant uses include acting as a binder in animal feed pellets, a dust suppressant, and a dispersant in ceramic and dye industries. It is also explored as a raw material for producing carbon fibers, resins, and other value-added chemicals. Sodium lignosulfonate is valued for being a renewable, biodegradable, and cost-effective material. It is generally considered to have low toxicity. Its performance can vary depending on the source of lignin and the degree of sulfonation.