Turning the key to on causes current to flow to light power draws like the fuel pump, ignition, etc.
But turning the key to start, causes 10 times that amount of current to go to the starter.
So one possibility is that the battery is weak, the battery terminals are dirty, etc., and you just don't have enough current.
But another possibility is that the starter is drawing far more current than it should, from something like an internal short, a frozen engine, etc.
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