Definition
"Shia Muslim" is a term referring to a follower of Shia Islam, one of the two major branches of Islam. Shia Muslims believe that the leadership of the Muslim community should have passed to Ali, the cousin and son-in-law of the Prophet Muhammad. It's synonymous with 'Shiite Muslim.' Consider it like saying 'soda pop' instead of 'pop' or 'soda' - just a variation in phrasing. Both terms are equally valid.