Few topics in cosmology are as hotly debated as the multiverse: for some it is untestable and hence unscientific; for others it is unavoidable and a natural extension of previous science. Some of this disagreement might be due to misunderstanding, in particular the degree to which probability distributions are necessary to interpret conclusions based on the multiverse, especially with regard to the anthropic principle. I present undisputed facts, discuss some common misunderstandings, and investigate the role played by probability. The multiverse is perhaps an important component necessary for interpreting cosmological and other physical parameters.