Laser filamentation is a fascinating phenomenon that occurs when an intense laser beam propagates through a transparent material, particularly air. At sufficiently high-power levels—terawatts in the near-infrared and gigawatts in the ultraviolet—the beam behaves in a remarkable way: instead of spreading out like a conventional laser beam, it self-focuses to form a thin, intense column of light known as a laser filament. Filamentation is characterized by two main features: (i) a high-intensity core that remains narrow over distances well beyond the Rayleigh range, and (ii) a low-density plasma channel within the core. This talk will provide a brief introduction to laser filamentation, with a focus on ultraviolet (UV) filaments. Experimental results on the applications of laser filaments will also be presented. It will be shown that UV filaments can be effectively utilized for Laser-Induced Breakdown Spectroscopy (LIBS), leading to improved spectral resolution and analytical accuracy. Furthermore, the phenomenon of air lasing induced by laser filaments will be discussed.