A foul is anything (including the infractions below) that makes a shot illegal. It results in CB in hand to your opponent, where they can place the CB anywhere they want on the entire table (unless on break, in which case it is ball in had in the behind the head string).
… based on the World Pool-Billiard Association (WPA) World Standardized Rules (the “official rules of pool”)
For more information see the rules resource page and the Pool Rules Quiz resource page.
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