The correct statements are 3 and 4. Augmented Reality (AR) enhances the real world by overlaying digital information onto it, often using the cameras of smartphones or PCs to enrich the user experience without shutting out the physical environment. In contrast, Virtual Reality (VR) fully immerses users in a simulated environment, effectively disconnecting them from the real world to provide a completely engaging experience. Understanding these distinctions is crucial for grasping the applications and implications of these technologies in entertainment and beyond, as outlined in standard UPSC-level sources.