Advertising ethics and regulation are crucial for maintaining trust and fairness in the industry. Key principles include honesty, responsibility, and respect for human dignity. The regulatory framework has evolved from early 20th-century laws to today's complex system of federal agencies, state laws, and industry self-regulation. Modern advertising faces ethical challenges like deceptive claims, targeting vulnerable groups, and data privacy concerns. Self-regulation plays a vital role, with industry associations developing best practices. Case studies highlight the impact of ethical decisions on brand reputation, while future trends point to increased focus on data privacy, authenticity, and purpose-driven marketing.