Sulfonic acid is a type of organic acid that contains a sulfonyl group (-SO3H). It is characterized by its strong acidity and is commonly used in various chemical processes. Sulfonic acids are often found in detergents, dyes, and pharmaceuticals due to their ability to enhance solubility and reactivity. One of the most well-known sulfonic acids is benzenesulfonic acid, which is derived from benzene. These acids can be produced through the sulfonation of aromatic compounds, making them important in industrial applications. Their unique properties make them valuable in creating surfactants and other chemical intermediates.