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, catalysis, and medicine. Common metals used to create nanoparticles include gold, silver, and copper. In medicine, metal nanoparticles are being explored for targeted drug delivery and imaging techniques. Their ability to interact with light also makes them valuable in developing sensors and enhancing the performance of solar cells.