In the digital era of the 21st century, Artificial Intelligence (AI) has become a core technology that drives innovation and efficiency in Internet marketing. This paper explores in detail the applications of AI in Internet marketing, including personalized marketing, customer service automation, market analysis, and marketing channel optimization. These applications not only improve the market competitiveness and customer satisfaction of enterprises but also promote the personalization and efficiency of marketing strategies. However, the widespread application of AI technology is also accompanied by risks such as data privacy, algorithmic bias, uncontrolled automation, and technology dependency. These risks threaten consumers' rights and interests and may affect the sustainable development of enterprises and social trust. Therefore, this paper emphasizes the importance of establishing strict data protection policies, enhancing algorithmic transparency, and preserving appropriate space for human intervention. AI is expected to continue to drive Internet marketing toward greater efficiency and personalization. In particular, conversational AI, content creation, and integration with augmented reality (AR) and virtual reality (VR) will provide users with a more immersive and personalized shopping experience. However, as technology evolves, ethical and privacy protection challenges will also become increasingly prominent, requiring businesses, regulators, and technology developers to work together to ensure the responsible use and healthy development of AI technologies. Through continued innovation and accountable practices, AI technology will shape the future of Internet marketing while ensuring that society's ethics and responsibilities are upheld.