At its core, the true nature of light is still a mystery. But we have come far in our understanding and uncovered a peculiar phenomenon. As weird as this can be, light sometimes appears to behave like a wave and other times like a particle, but it is never really either of the two. This notion of duality was a crucial milestone that lies at the foundation of quantum physics.

Photons are the elementary constituents of light. They are quantum objects with no mass and no charge, characterized by their frequency, or how fast their electromagnetic field oscillates. They are the fastest inhabitants of the Cosmos, and their speed in the vacuum cannot be surpassed.

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