The Muslim world has two meanings.

In a cultural sense it is a term given to the world-wide community of those who adhere to the religion of Islam. This community, whose members are known as Muslims, number approximately 1.4 - 1.6 billion people. This community does not constitute a distinct race, but are spread across every race; the world's Muslims are connected only by the heritage of adhering to a common religion.
In a geographical and political sense (especially in the historical context) the terms Muslim World and Islamic world refer to geographical and political entities with domination of Islam. In this sense the expression corresponds to the Islamic term .
The diaspora of Muslims worldwide are also known collectively as the ummah.[citation needed] The Islamic faith emphasizes unity and defense of fellow Muslims, so it could be expected for Muslim nations to co-operate. However, nationalist currents have tended to divide rather than unite the Islamic world, particularly in the second half of the 20th century.

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