Aircraft warning lights are like a special kind of flashlight on tall buildings or towers, so planes don't accidentally bump into them when they're flying in the sky.
The lights are usually red or white and blink on and off. Imagine blinking your eyes like a superhero, that's what the lights do too!
The towers and buildings are very tall and it's hard for pilots to see them easily because they're so high up in the air. So, the blinking lights make it easier for pilots to see where the buildings and towers are and not crash into them by accident.
Just like how you wear a helmet when you ride your bike to keep you safe, these lights keep airplanes and pilots safe too!