A concrete poem creator is an application that allows users to combine words and pictures into a concrete poem. A concrete poem is one in which the words are arranged to form a picture relevant to the content of the poem.
Typographical concrete poetry became an established form in the early 20th century, though some examples of it exist from as far back as the third century BC. The defining feature of concrete poetry is that it functions as both a poem and a piece of visual art. If the formatting of the poem were removed, the work would lose much of its meaning.