The Nuclear Spectroscopic Telescope Array (NuSTAR) is a space-based X-ray telescope launched by NASA on June 13, 2012. It operates in the high-energy X-ray spectrum, allowing astronomers to study phenomena such as black holes, neutron stars, active galactic nuclei, and supernova remnants in greater detail than previously possible. NuSTAR is the first telescope to focus light in the high-energy X-ray (3 to 79 keV) region of the electromagnetic spectrum, providing significantly improved sensitivity and resolution compared to non-focusing observatories that operated in the same range. Its unique capabilities enable it to observe and record data on some of the hottest, densest, and most energetic regions in the universe, providing valuable insights into the extreme processes of cosmic particle acceleration and the dynamics of cosmic events.