the organizations' intended audience and if fully invested in the cause they are promoting can greatly influence the process of persuading others and attracting attention towards a world issue. Goodwill ambassadors make widely publicized visits to the world's most troubled regions, and make appeals on behalf of their people and the organization. The United Nations goodwill ambassadors include famous celebrities like Angelina Jolie for UNHCR, David Beckham and Shakira for UNICEF, Christina Aguilera for WFP and Nicole Kidman for UN Women. Promotional model A promotional model is a type of a spokesmodel, trade show model and convention model. These models carry out functions beyond representation of the company in a positive light. The main difference between a brand ambassador and a promotional model is in the way they represent the product/service. In many cases, unlike brand ambassadors, a promotional model may give the audience an experience that reflects the product or service being branded. Promotional models are required to be present at the venue as per the requirements of the marketing campaign, however brand ambassadors are most often referred to as the 'face of the brand' . Promotional models are most often found in trade shows exhibits (in some cases referred to as "booth babes"), conventions and in print, digital or selected advertisements for the brand. The use of so-called "booth babe" models at trade show exhibits and conventions has been criticized by some. Testimonial Testimonial is simply a way of conveying assurance, in this case assurance is provided by the testimonial of the company or product/service in question in a written or spoken manner. A testimonial does not advertise the product freely unlike the role of the brand ambassador. A brand ambassador performs the function of a testimonial but a testimonial is not a brand ambassador. By simply providing a testimonial for a product/service, one need not be an ambassador for the same. For example, a customer can be a testimonial, since a testimony could be formal or informal "word of mouth" advocating the positive facets of the product. On the other hand, a consumer could not always be brand ambassador, since the latter is more commercial and is often considered as a position bound by monetary and professional liabilities. To a certain degree, celebrity endorsements provide testimonials for the product/service they are marketing. However, with the advent of the digital age testimonials have reached an all-time high. A