Advertising is a paid form of non-personal promotion to introduce or promote a product, service or idea. The purpose is to convince potential customers to purchase or use what is being advertised. Advertising decisions involve setting objectives, budgets, messages and evaluating effectiveness. Objectives can be informative, persuasive, for reminder or reinforcement. Budgets are set through top-down or bottom-up approaches. Messages are created and media is selected to reach the target audience. Effectiveness is measured through communication effects and sales effects.