Is Light Matter and Does It Weigh Anything?

Is light matter or a wave? If it's matter, how can you measure what light weighs? Einstein's theory of relativity simultaneously clarifies and muddies things.
Seven ounces a ray! No, that's a lie. Measuring the weight of light is not as straightforward as that. So what's the more complicated explanation?

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Does light add weight (even if it's only a very small amount) to something when you shine it at it? - Quora

If energy and matter are one and the same thing, how does light not have mass, when it does have energy? - Quora

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