Pulsars, rapidly rotating neutron stars, are cosmic beacons that emit electromagnetic radiation, offering insights into extreme physics and the very fabric of spacetime. Pulsar Phenomena explores these celestial objects, emphasizing their role as invaluable probes of fundamental physics and cosmology. Their predictable pulsations enable precise measurements, facilitating tests of general relativity and searches for gravitational waves. The book presents a comprehensive overview of pulsar formation, structure, and emission mechanisms, highlighting their significance in understanding the universe's most enigmatic phenomena. The book progresses from foundational concepts of stellar evolution and electromagnetism to detailed explanations of pulsar emission mechanisms and their diverse types, such as radio, X-ray, and millisecond pulsars. It then delves into their applications in astrophysics, focusing on testing general relativity and detecting gravitational waves. A unique aspect of pulsars is their extreme density and magnetism, allowing scientists to test the limits of physical theories. The book’s structure guides readers through a comprehensive understanding, supported by observational data from various telescopes and observatories, offering a holistic view of these objects’ role in astrophysics.