Common uses of graphic design include logos (trademarks and brands), publications (magazines, newspapers and books), print advertisements, posters, billboards, graphic elements of websites, logos and product packaging. For example, product packaging may include trademarks or other works of art, arranged texts and pure design elements, such as images, shapes and colors with uniform styles. Combination is one of the most important features of graphic design, especially when the product uses pre-existing materials or multiple elements.