Graphic design is important in the sales and marketing of products, and is a critical component of brochures and logos. Therefore, graphic designers, also referred to as graphic artists or communication designers, often work closely with people in advertising and promotions, public relations, and marketing. Frequently, designers specialize in a particular category or type of client. For example, some create the graphics used in packaging for various types of retail products, while others may work on the visual design used on a book jacket.