The main purpose of signs is to communicate, to convey information designed to assist the receiver with decision-making based on the information provided. Alternatively, promotional signage may be designed to persuade receivers of the merits of a given product or service.
Signage is a term that is defined as all of the visual graphics (public advertisements, billboards, etc.) or groups of graphics that communicate information to the public. A row of billboards along a roadway advertising beer companies, insurance companies, lawyers and nearby restaurants is an example of signage.