Random fiber laser (RFL), whose lasing is based on the remarkable random distributed feedback without a conventional defined laser resonator, is nowadays the object of intensive research for its unique features such as cavity-free, mode-free, and structural simplicity. In this chapter, we will review the multidisciplinary demonstrations and applications of RFLs in the past decade. The power of single-stage structured RFL has been scaled to 2 kW level. By employing fiber MOPA scheme, it was amplified to 10 kW successfully. In the temporal domain, pulsed random laser has been obtained with pulsation width ranging from milliseconds to picoseconds, which can enrich the laser physics and related dynamics occurring in the interaction between light and disordered media. As to the spatial dimension, advancements on linearly polarized operation, higher order mode generation, cylindrical vector beam and vortex beam carrying orbital angular momentum, and beam cleanup-induced brightness enhancement indicated that RFLs have tremendous potential in controlling and diversifying output spatial modes. Furthermore, spectral flexibility of RFLs, such as wide-range tunability, high spectral purity, multiwavelength operation, narrowband and supercontinuum generation, has been demonstrated. Benefitting from the fast performance developments, RFLs have been versatile tools for wide applications, such as pumping, sensing, imaging, random bits generation, and new laser source construction. Furthermore, the potential new horizon of RFLs will be proposed preliminarily.