Difference Between White and Black Pepper

Both black and white pepper both come from the berries of the same plant, known technically as piperaceae. How the berries are processed determines whether the resulting spice will be black or white.  Black pepper has a more pungent (sharp or intense) flavor than white.  White pepper is often ground more finely than black and is used when specks of black would be objectionable in the finished dish. Source - Purdue University