Is Light a Particle or a Wave?

Like the other person said, yes.

It is neither and both. Forgive the tautology, but light behaves like light. If you want a metaphor to reason about it in relation to how macroscopic matter works, there are many situations where either a fluidic or particle metaphor works, and some paradoxically where only one seems to work. The best metaphors seem to be something like a particle-wave that is either both simultaneously and which you see depends on how you look, or maybe it is something which can flip between these conflicting natures at need. Most perplexing. But in the end, these are only metaphors. Photons are not ripples on a pond. The electromagnetic field is not a pond. And it is not a billiards table, either. Like all metaphors, these metaphors will eventually break if you stretch them too far.

I've given up on the assumption that I should intuitively be able to understand the stranger parts of physics. Do the equations work? Then that's how it behaves. There's no particular reason to expect that classical approximations from the world of human-scale things would scale up or down infinitely. Nor do we even internalize those classical models very well. My monkey brain just does not have naive models that are well-equipped to handle such weird things.

It is sort of a field. And can exhibit wave or particle like behaviour under specific conditions.

I thought that this was common knowledge and is taught at undergrad courses now. Guess naval must be talking about back when he was an undergrad.

Yes

Who's asking?