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Palladium is a chemical element with the symbol Pd and atomic number 46. It is a rare and lustrous silvery-white metal belonging to the platinum group metals. Discovered in 1803 by William Hyde Wollaston, palladium is found in small concentrations in the Earth's crust, often alongside platinum and nickel ores. Its chemical properties are similar to platinum, exhibiting high resistance to corrosion and tarnishing.

The primary uses of palladium are in catalytic converters for automobiles, where it helps convert harmful exhaust gases into less noxious substances. This application accounts for the vast majority of palladium consumption. Other significant uses include jewelry, dentistry, electronics, and as a catalyst in various chemical reactions. Palladium is also used in rechargeable batteries and in water purification systems.

Palladium is more reactive than platinum and is soluble in oxidizing acids. It has a relatively low melting point compared to other platinum group metals. The global supply of palladium is dominated by a few countries, with Russia and South Africa being the largest producers. Its price can be volatile due to its industrial demand and limited supply.