Metal nanoparticles are tiny particles made of metals, typically ranging from 1 to 100 nanometers in size. Due to their small size, they exhibit unique physical and chemical properties that differ from bulk metals. These properties make them useful in various applications, including electronics, medicine, and environmental science. Common metals used in nanoparticles include gold, silver, and copper. In medicine, metal nanoparticles can be used for targeted drug delivery and imaging. In environmental applications, they can help in the removal of pollutants. Their versatility makes them a significant area of research in nanotechnology.