Kampfgeschwader 200 (KG 200) was a fancy name for a group of fighter planes that were used during World War II.
Imagine a bunch of toy planes flying around in the air, but these planes were real and they were used by the Germans during the war. The KG 200 planes were not like regular fighter planes, though. They were special planes that were designed to do secret missions for the Germans.
These secret missions involved flying behind enemy lines and spying on the other side or dropping off spies in enemy territory. The pilots who flew these planes were specially trained to do these missions and they were very good at it.
We don't use these types of planes anymore because using fighter planes for spying or dropping off spies is not very effective. Plus, it's not very nice to spy on or hurt other countries. So, we use different tools and methods to get information and protect ourselves now.