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

If we’re talking photons and electrons etc: well, they’re simply not *actually* particles. We just call them that because they kinda behave like little particles most of the time, and what they *actually* are is so damn complicated to understand. So we call it a wave or a particle or both, but it’s kinda not either of them. It is its own thing, whatever we want to call it.