Modernism-a definition

http://www.tate.org.uk/collections/glossary/definition.jsp?entryId=174

In the field of art the broad movement in Western art, architecture and design which self-consciously rejected the past as a model for the art of the present. Hence the term modernist or modern art. Modernism gathered pace from about 1850. Modernism proposes new forms of art on the grounds that these are more appropriate to the present time. It is thus characterised by constant innovation. But modern art has often been driven too by various social and political agendas. These were often utopian, and modernism was in general associated with ideal visions of human life and society and a belief in progress. The terms modernism and modern art are generally used to describe the succession of art movements that critics and historians have identified since the Realism of Courbet, culminating in abstract art and its developments up to the 1960s. By that time modernism had become a dominant idea of art, and a particularly narrow theory of modernist painting had been formulated by the highly influential American critic Clement Greenberg. A reaction then took place which was quickly identified as Postmodernism.

From Tate glossary.

Postmodernism - another definition

"A general explanation is that postmodernism is a contradiction in terms, as post means after and modern means now, it is impossible for anything to be after now. The term itself is supposed to be deliberately unexplainable.

In terms of literature and media it is generally considered to be anything which makes little attempt to hide the fact that it is not real, it wants you to know that its been created and it wants you to recognise elements from elsewhere (i.e. that they have 'stolen' ideas from other sources), that there are no new or original ideas and that everything is in someway connected. Importantly it doesn’t want you to view it as being any more or less valid or important than a text which pretends to be real, postmodernists want everything to be equal, they want to remove binary opposites and start again. Students are often criticised for being post modern as they tend to like 'naff' things and think they are cool precisely because they aren't cool (thus removing binary opposites)"

Michael Smith (2009)

Postmodernism - a definition

Postmodern texts deliberately play with meaning. They are designed to be read by a literate (ie experienced in other texts) audience and will exhibit many traits of intertextuality. Many texts openly acknowledge that, given the diversity in today's audiences, they can have no preferred reading (check out your Reception Theory) and present a whole range of oppositional readings simultaneously. Many of the sophisticated visual puns used by advertising can be described as postmodern. Postmodern texts will employ a range of referential techniques such as bricolage, and will use images and ideas in a way that is entirely alien to their original function (eg using footage of Nazi war crimes in a pop video).