googled it and found it in yahoo answers:
Squash: http://en.wikipedia.org/wiki/Squash_%28s…
Racquetball:http://en.wikipedia.org/wiki/Racquetball
Racquetball is a racquet sport played with a hollow rubber ball in an indoor or outdoor court. Joe Sobek invented the sport in 1948, incorporating rules from squash and handball. Unlike most racquet sports, such as tennis or badminton, the court's walls, floor, and ceiling are legal playing surfaces, rather than out-of-bounds.
Squash:The relatively small court and low-bouncing ball makes scoring points harder than in its American cousin, racquetball, as the ball may be played to all four corners of the court. Since every ball must strike the front wall above the tin (unlike racquetball), the ball cannot be easily 'killed'. As a result, rallies tend to be longer than in racquetball.