Methanesulfonic acid is widely used as an acid catalyst in organic synthesis due to its strong acidity and stability. It is particularly valuable in esterification, alkylation, and polymerization reactions, where it ensures high yields and clean product formation. In the pharmaceutical industry, it serves as a key reagent in the production of active pharmaceutical ingredients (APIs) and intermediates. Its non-oxidizing nature makes it suitable for use in electroplating and metal finishing processes, where it helps deposit metals like tin and lead with high efficiency. Additionally, it is employed in the production of surfactants, dyes, and specialty chemicals. Its low toxicity and biodegradability also make it a preferred choice in environmentally sensitive applications.