What is the difference between racquetball and tennis?

Racquetball and tennis are both racket sports played on a court, but there are key differences between the two. In racquetball, the court is enclosed and the ball can bounce off any wall, while in tennis the court is open and the ball must stay within the lines. Additionally, racquetball uses a smaller, harder ball and players can hit the ball after one bounce, whereas in tennis players must hit the ball before it bounces. The scoring system and rules also differ between the two sports.