Methanesulfonic acid is widely used as a catalyst in organic synthesis due to its strong acidity and stability. It is particularly effective in esterification, alkylation, and polymerization reactions, including the production of pharmaceuticals, pesticides, and intermediates like methyl methacrylate. In the pharmaceutical industry, it serves as a key reagent in the production of active pharmaceutical ingredients (APIs). Additionally, it is utilized in electroplating processes, where it acts as an electrolyte for depositing metals like tin and lead, offering a safer and more environmentally friendly alternative to traditional acids, and improves coating quality in metal plating. In the electronics industry, it is employed in the manufacturing of printed circuit boards (PCBs) for etching and cleaning purposes. It also functions as an electrolyte solution in flow batteries for energy storage. Its high solubility in water and low toxicity make it suitable for use in cleaning agents, detergents, rust and dirt removal from metal surfaces, water conditioning in wastewater treatment systems, and improving properties in the rubber and plastics industries.