A palladium catalyst is a substance that speeds up chemical reactions without being consumed in the process. It is made from palladium, a precious metal known for its ability to facilitate various reactions, particularly in organic chemistry. Palladium catalysts are commonly used in processes like hydrogenation, where hydrogen is added to unsaturated compounds, and in cross-coupling reactions, which help form carbon-carbon bonds. These catalysts are essential in industries such as pharmaceuticals and petrochemicals, where they help produce complex molecules efficiently. Their effectiveness and versatility make palladium catalysts valuable tools in both research and commercial applications, contributing to advancements in chemical synthesis.