This document provides an overview of advertising, including definitions, objectives, classifications, and the structure and functions of advertising agencies. It defines advertising as a paid, non-personal form of promotion and defines modern advertising as a complex communication using strategies to impact consumer behavior. The document outlines the basic factors of advertising and objectives such as brand awareness, sales increases, and profit growth. It then classifies advertisements based on consumers, media, business type, and area. Finally, it describes the major departments of advertising agencies, including creative, media, production, accounting, and examples of top agencies in India.