It is difficult to come up with a satisfactory answer for everyone when it comes to which is the world's most advanced fifth generation fighter jet. But if we were to select the world's popular fifth generation aircraft, then the F-35 Lightning II would definitely be on the list. Due to its short, chubby physique, it is also affectionately referred to as "fat electricity" by military enthusiasts. Next, we will analyze why the F-35 Lightning II is so popular from five aspects? 1. As the fifth generation aircraft with the highest number of active combat aircraft in the world, the F-35 has high stealth performance, advanced electronic systems, and hypersonic cruising capabilities. It can perform various tasks such as frontline support, target bombing, air defense interception, and adapt to different combat needs. 2. Excellent stealth performance is widely believed to be essential for fighter jets to survive in high threat environments on modern battlefields. According to the United States Naval Academy (NPS. edu), the Air Force claims that the radar cross section (RCS) of the F-35 is approximately 0.0015 square meters, the size of a metal golf ball. Although it has a radar cross-section 5 to 10 times larger than the F-22, it is still one of the stronger stealth aircraft in the world today. 3. With the changing security situation in some parts of the world, more and more countries are starting to order and increase the purchase of F-35 fighter jets, fearing that they will not be able to schedule orders if ordered too late. At present, the production of F-35 has exceeded 1000 aircraft, and about 20 countries worldwide are already using or planning to use it. 4. Advanced avionics equipment and electronic warfare capabilities. The F-35 is not just a fighter jet, but also an advanced computer platform equipped with large touch screens and helmet mounted displays that enable pilots to see real-time information through the aircraft. It is reported that the fighter jet also has a Distributed Aperture System (DAS) and a set of mountain infrared cameras. Thanks to sensor kits and advanced radar, the F-35 has become a popular fifth generation aircraft worldwide. 5. Three derivative models meet various needs. Depending on different models, the takeoff capabilities of the F-35 include CTOL, STOVL, and CV/CATOBAR. The three derivative models developed from it adapt to different combat needs, including the F-35A model that uses traditional runway takeoff and landing, the F-35B model that uses short distance takeoff and landing/vertical takeoff and landing, and the F-35C model that serves as a carrier based aircraft. Although the F-35 has been controversial throughout the entire development process due to issues such as delays, cost overruns, and performance doubts, its advantages of versatility, versatility, low cost, and high informatization cannot be ignored. In the future, the F-35 will not only become the main aircraft of the United States Navy, Air Force, and Marine Corps, but will also be exported to more Western countries and active in the international stealth fighter market. Overall, the future development prospects of the F-35 appear to be relatively broad, but the specific development situation still needs to be observed based on procurement decisions and market reactions in various countries. (Lai Xin She)