A poster is a large sheet that is placed either on a public space to promote something or on a wall as decoration. Typically, posters include both textual and graphic elements, although a poster may be either wholly graphical or wholly text. Posters are designed to be both eye-catching and informative. Posters may be used for many purposes.
Posters can be printed on matte or gloss paper, with or without lamination. 
Posters come in the following sizes:
A3
A2
A1
A0