It falls into a paradox based on observation. If you measure it in one way it shows it acts as a wave (diffraction, polarization, etc.). However, if you measure other traits, such as energy transmitted, that is only currently explainable as a particle, mainly photons. This has become one of the greatest debates in physics with Nobel Prizes being given for furthering our understanding.
[A great video about the topic by an Oxford astrophysicist .](https://youtu.be/HAeDBLUT9JA)
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