Final answer:
The server must perform a legal serve within the game's rules, targeting specific areas as required, while the receiver must be ready to return the serve by positioning themselves strategically and judging the legality of the serve.
Step-by-step explanation:
During a serve, the server and the receiver both have specific roles to play. The server must ensure that they conduct a legal serve according to the rules of the sport, which typically involves a specific motion and area within which the ball must land on the opponent's side.
For example, in tennis, the server must hit the ball diagonally across the net and into the correct service box without the ball touching the net. The serve must also be performed within a given time limit after the scorer has announced the score.
Meanwhile, the receiver must be prepared to return the serve. They have to position themselves in a manner that maximizes their chances of successfully reaching the ball and playing it back effectively. In most racquet sports, the receiver cannot touch the baseline or the court before the ball is hit.
The receiver must also judge whether the serve is legal; for example, if the ball lands outside the designated area, the receiver has the right to deem the serve a fault.
Both server and receiver engage in a tactical play where positioning, readiness, and quick judgment are essential. To summarize, the server focuses on the correct delivery of the ball, while the receiver prepares to react and respond to that delivery.