The term "Poster art" describes a general category of printed 2-D artwork which is designed to be affixed to a vertical surface. Its evolution and development was (and is) closely linked to advances in printmaking processes, notably lithography and offset litho, which in turn are strongly influenced by photographic and software techniques.
Posters may consist exclusively of images, or images and text. In rare cases (eg. works of calligraphy) it may consist entirely of textual graphics.