People of the Book
The Qur'an distinguishes between the monotheistic People of the Book ("ahl al-kitab"), i.e. Jews, Christians, Sabians and others on the one hand and polytheists or idolaters on the other hand'. There are certain kinds of restrictions that apply to polytheists but not to "People of the Book" in classical Islamic law. One example is that Muslim males are allowed to marry a Christian or Jew, but not a polytheist. Muslim women, however, may not marry non-Muslim men.