>>11327790>what does it meanIf what you mean by this is "How can something behave like a particle and a wave at the same time?" there's numerous ramifications, most of which we don't fully understand and are still investigating. The best we can say for now is that our topical understanding of the universe from our "Newtonian" perspective of traditional mechanics and interactions is definitely incomplete, and that our intuition we've gained from observing the universe we can directly interact with doesn't not apply at the quantum level.
If you're asking literally, all that means is that we have observed photons having both wave and particle behaviors, as
>>11327801 said.