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miro_o
13-15mm is normal width*.
17mm+ is wide.
The advantage is simply that a 23mm on a wide rims feel closer to a 25mm tyres due to being able to run them at a lower pressure without the tyres feeling squirmy.
Best combination is running 25mm.
It also advantageous if you have an old road bike whose clearance maxed out at 23mm, tyres sit lower on the wider rims.
*measured internally).