We can confirm that in tennis, as with many other sports, when you serve the ball, if the ball does not land in the opposite side rectangle this is called a fault or foul.
What is a fault/foul?
As stated in the question, this is when you serve the ball, if the ball does not land in the opposite side rectangle. This would mean that the ball has gone out of the bounds of the playing field and given that this is against the rules, it often results in a benefit for the opposing team.
Therefore, we can confirm that when you serve the ball, if the ball does not land in the opposite side rectangle this is called a fault or foul.
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