Is racquetball like tennis?
Depends how you define each. Tennis, unlike racquetball, has an out-of-bounds feature that racquetball does not. Both are played with racquets although each sport has it’s own design and both use a ball, which also varies between the two sports. The technique and skills needed to play are different; but if you have played either of the of the sports before, you will have the fundamental knowledge on how to use the racquet for both sports.