Wiffle balls are made of a light weight plastic, with numerous holes in them. The holes help to slow down the speed of the ball when thrown, or struck. Because the balls have little weight they are much safer for small kids to play with, and they also won't cause as much damage should they strike something.
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Most softballs are made out of a solid polyurethane core and a leather cover stitched up with a nylon thread. There is also glue attaching the core and the cover of the softball.
However, there are some softballs, the more inexpensive ones, that are made of a cork center and a synthetic cover.
A baseball is made from yarn surrounding a rubber or cork center. It is then covered with cowhide.