Jet fighter generations are used to classify the technological advancements made in jet fighter aircraft. The generation system is not an official one, and there is no set criteria for determining which generation a jet fighter belongs to. However, some common characteristics are used to distinguish between different generations.
Generation 5 jet fighters are those that were developed in the late 1980s and 1990s. These jets typically feature advanced avionics, stealth technology, and sophisticated weapons systems. Some examples of Generation 5 jet fighters include the F-15 Eagle, F-16 Fighting Falcon, and F-22 Raptor.

Generation 6 jet fighters are those that are currently being developed or have recently entered service. These jets feature even more advanced technology and capabilities than their Generation 5 counterparts. Some examples of Generation 6 jet fighters include the F-35 Lightning II, the Chengdu J-20, and the Sukhoi Su-57.
One key difference between Generation 5 and Generation 6 jet fighters is their level of stealth technology. Generation 5 jets were designed with a focus on low observable (LO) technology, which makes them difficult to detect on radar. Generation 6 jets, on the other hand, are being designed with a greater emphasis on full stealth capabilities, which make them virtually invisible to radar.
Another difference is the level of integration between different systems on the aircraft. Generation 6 jets are being designed with more integrated avionics systems, which allow for a greater level of situational awareness and improved decision-making capabilities.
In terms of weapons systems, both Generation 5 and Generation 6 jet fighters are equipped with a wide range of missiles and bombs. However, Generation 6 jets are being developed with more advanced weapons systems, such as directed energy weapons and hypersonic missiles.
Overall, the main difference between Generation 5 and Generation 6 jet fighters is the level of technological advancement. Generation 6 jets are designed to be more stealthy, more integrated, and more capable than their predecessors. However, both generations of jet fighters are incredibly sophisticated and capable aircraft, and they will continue to play a crucial role in the defense of nations around the world.