XUV, or extreme ultraviolet, is a research area in the field of optics and photonics that focuses on studying light with wavelengths in the range of 10 to 100 nanometers. This area of research is important for applications in nanotechnology, materials science, and biological imaging, as XUV light has unique properties that allow for high resolution and high contrast imaging of samples at the nanoscale. Research in the XUV range also has implications for advancements in semiconductor manufacturing, spectroscopy, and atomic and molecular physics.