Lanthanum is a chemical element with the symbol La and atomic number 57. It is a soft, silvery-white metal that belongs to the group of elements known as the lanthanides. Lanthanum is typically found in minerals such as monazite and bastnäsite, and it is often extracted through chemical processes. This element is used in various applications, including the production of high-quality glass and as a catalyst in petroleum refining. Additionally, lanthanum plays a role in the manufacturing of certain types of batteries and phosphors for LED lights, contributing to advancements in technology and energy efficiency.