The “Speed of light” is in reality the speed at which information can be transmitted in our universe. This includes everything, also gravity. Light travels at the maximum speed at which information can be transmitted, same as gravity and other things.
That is the reason why nothing can be faster than light, but it also means that light isn’t the only “fastest thing in the universe”.
We only call it the speed of light because historically that was the first thing people researched.
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