In marketing an advertising, a target audience, or target group is the primary group of people that something, usually an advertising campaign, is aimed at appealing to. A target audience can be people of a certain age group, gender, marital status, etc. (ex: teenagers, females, single people, etc.) A certain combination, like men from twenty to thirty is often a target audience. Other groups, although not the main focus, may also be interested. Discovering the appropriate target market(s) to market a product or service to is one of the most important stages involved with market research. Without knowing the target audience, a company's advertising and the selling efforts can become difficult and very expensive.