Time is one dimension. Its what’s shown on your clock. We can only move in one direction through time.
Space is made up of 3 dimensions (like x,y,z). You can move around in all directions in it and you measure it with a ruler.
Together, anything that happens, be that me sitting here typing this, or a firework going off, or whatever, any event is described with those 4 dimensions: (x, y, z, t). You might even say “I went to the store on X street at 3:00pm”, thats describing the event of you going to the store with a position in space (X street) and a time (3:00pm)
In physics you hear “spacetime” because of the above. We plot events in that 4d coordinate system that consists of “space” and “time”. Hence “spacetime”.
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