Lorentz transformations help us transform coordinates of one frame to that of another.
For example, let the coordinates of an event in an inertial frame $S$ be $(x, t)$, then the coordinates in frame $S'$ is got as $(x', t')$ using Lorentz transformations.
This means that there is some kind of equivalence between $(x, t)$ and $(x', t')$. But what kind of equivalence is it?
What I am trying to ask is What does it mean to say coordinates of the same event? What is an event?
Edit: I am probably wrong about this, but anyways: I think all the current answers are circular. I am asking about events so as to understand what spacetime means. But, all the answers involve spacetime in one way or the other. You can't just say an event is a location and a time because that is what I am trying to understand. Without absolute space and absolute time, what does that mean?
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