The book introduces the basic knowledge and applications of artificial intelligence in a simple and easy-to-understand way, using case studies to make it easier for readers to read. The book consists of five chapters, starting with the introduction of basic knowledge about AI. It then covers natural language processing, image processing, speech recognition, and other AI research fields from the aspects of texts, images, and speech. Finally, practical cases are provided for readers to gain a comprehensive understanding of AI applications. This book is suitable for middle and high school students hoping to understand the basics and applications of AI. It can also serve as study material for beginners interested in AI.