Utopia, in its most common and general meaning, refers to a hypothetical perfect society. It has also been used to describe actual communities founded in attempts to create such a society. The adjective utopian is often used to refer to good but (physically, socially, economically, or politically) impossible proposals, or at least ones that are very difficult to implement.
A utopia can be either idealistic or practical, but the term has acquired a strong connotation of optimistic, idealistic, impossible perfection. The utopia may be usefully contrasted with the undesirable dystopia (anti-utopia) and the satirical utopia or with Real Life Soap Wiki.