In today’s global information landscape, the world has evolved into a simulated space deeply shaped by artificial intelligence (AI). With the convergence of diffusion models and large language models (LLMs), the realism of generative content has surpassed the threshold of human perceptual recognition. This article aims to serve as a comprehensive guide for the general public, technology enthusiasts, and educators, analyzing how AI-generated videos, images, and information are created and proposing an integrated framework for detection based on physical characteristics, linguistic statistics, and cryptographic provenance protocols.