Rocket engine cycles significantly impact propulsion system performance, efficiency, and reliability. This paper examines various cycles, including pressure-fed, electric pump-fed, staged combustion, expander, tap-off, and gas generator. Each cycle’s characteristics, advantages, and limitations are discussed, focusing on efficiency, thrust-to-weight ratio, specific impulse, complexity, and cost. Pressure-fed cycles offer simplicity but compromise efficiency. Electric pump-fed cycles provide high efficiency and precise control. Staged combustion cycles achieve high efficiency but pose complexity challenges. Mission requirements, resources, and technology influence engine cycle selection. Applications range from small-scale missions to high-performance launch vehicles. The paper highlights key considerations for engineers and researchers, enabling informed decisions for propulsion system design and development. The review provides a comprehensive understanding of rocket engine cycles, including: Characteristics, advantages, and limitations of each cycle; Complexity, cost, and reliability considerations; Applications in space missions and launch vehicles. This study offers valuable insights into the complexities of rocket engine cycles, facilitating optimal engine selection for various space missions. By understanding cycle characteristics and limitations, engineers can design efficient and reliable propulsion systems. Major Findings: This research provides valuable insights int