What really is a particle? How can massless particles exist? How can it still be a particle if it doesn’t have any mass?

Question

What really is a particle? How can massless particles exist? How can it still be a particle if it doesn’t have any mass?

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Answer 1

The simplest possible answer I can come up with for how something like a photon can be considered a massless particle it’s because it occupies a relatively discreet place in space, and in many ways in interacts with matter as if it is a particle, like how it bounces off.