Publicis Groupe is a French multinational advertising and public relations company, headquartered in Paris. After 1945 the little-known Paris-based advertising agency grew rapidly, becoming the world's fourth-largest agency. It was a leader in promoting France's post-war economic boom, especially the expansion of the advertising industry; it was successful because of its close ties with top officials of the French government, its clever use of symbols to promote itself, and its ability to attract clients from widely diverse growing industries.