What's the general idea of multiculture?

Multiculturalism is the idea or belief that modern societies should embrace and include distinct cultural groups with equal cultural and political status.Multiculturalism is a term often used to describe the cultural and ethnic diversity of a nation.In the English-speaking countries it started in Canada in 1971.It was quickly adopted by most member-states in the European Union.
for example
multilingual and multi-ethnic empires,such as the Austro-Hungarian Empire and the Ottoman Empire
http://www.uwm.edu/~gjay/Multicult/Multiculturalism.html

blending of at least two different cultures that refers to one sort of culture which represents multi-styles.

it means the combination of different kinds of culture.
eg:multiculture metropolis and become international viewed but is not for those who want to find another total new culture and kick their original one away.

multiculture means a kind of culture that it is mixture of two or more other cultures, just like we say New York city is a city of almost al kinds of cultures, cause there are so many people of different races, different colors, their culture mix together and that's New York culture, a multiculture.