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 bastnasite, and it is often used in various applications, including catalysts and phosphors in lighting. This element is known for its ability to absorb neutrons, making it useful in certain nuclear applications. Lanthanum compounds are also used in the production of high-quality glass and ceramics, enhancing their optical properties. Its unique characteristics make it valuable in both industrial and scientific fields.