Pulsars: a concise introduction.

This article provides a comprehensive overview of pulsar astronomy, summarizing fifty years of observations and theoretical developments related to neutron stars and pulsars. Neutron stars are extremely dense remnants of supernova explosions, often observable as pulsars—rotating neutron stars emitting periodic beams of radiation across the electromagnetic spectrum, notably in radio and gamma-rays. Key discoveries include the identification of pulsars through radio signals in 1967, the detection of X-ray binaries involving neutron stars, and the classification of millisecond pulsars and magnetars. Pulsars serve as precise cosmic clocks, enabling tests of general relativity through timing measurements in binary systems. Advances in radio telescope technology and multi-wavelength observations continue to expand the pulsar catalog and deepen understanding of their emission mechanisms, evolution, and role in astrophysics.