Advertising plays important economic, ethical, and social roles. Economically, it makes consumers aware of products, provides purchase information, and encourages consumption. It differentiates products, builds brand loyalty, and supports media and employment, though it can increase costs. Socially, advertising must follow social norms and risks deception, manipulation, and offending tastes. Ethically, truth and avoiding harm to children are key concerns. Regulators seek fair practices through standards and guidelines.