modernism describe aseries of reforming culture movements in art and architecture ,music ,literature and the applied arts which emerged roughly in the period of 1884_1914.the term covers many political ,cultural and artistic movements rrooted in the changes in western society at the end of the nineteenth and beginning of the twentieth century.it is a trend of thought that affirms the power of human being to create ,and reshape their enviroment ,with the aid of scientific knowledge ,technology and practial experimention. postmodernism is a term appllied to a wide_ranging set of development in critical theory ,philosophy ,architecture , art ,literature ,and culture ,which are generally characterized as either emerging from , in reaction to ,or superseding ,modernism .postmodernism was originally a reaction to modernism )not necessarily "post" inthe purely temporal sense of "after").largely influenced by the disillusionment induced by the second world war,postmodernism tends to refer to acultural ,intellectual ,or artistic state lacking a clear central hierarchy or organizing principle and embodying exterme complexity, contradiction, diversity ,and interconnectedness or interreferetiality.