Augmented Reality (AR) & Virtual Reality (VR) Development (Unity/Unreal Engine) is an immersive, project-based course tailored for developers and designers eager to create next-generation interactive experiences using industry-leading tools. The course begins with a foundational understanding of spatial computing, distinguishing between AR, VR, and Mixed Reality (MR), and exploring their applications across sectors such as gaming, healthcare, retail, education, and industrial training. Learners dive into the development pipelines of Unity and Unreal Engine, gaining hands-on experience in building 3D environments, manipulating physics, lighting, animations, and user interactions. They explore 3D modeling basics, importing assets from tools like Blender, and using game engines' built-in asset stores. For AR, learners work with ARKit (iOS), ARCore (Android), and cross-platform SDKs like Vuforia and 8thWall to build applications that overlay digital objects onto the real world through smartphones, tablets, and AR glasses. In VR, students build immersive environments with full spatial presence, implementing teleportation, room-scale movement, gesture-based controls, and hand tracking using Oculus Quest, HTC Vive, or Windows Mixed Reality headsets. They explore scene management, head tracking, gaze-based selection, and haptic feedback for deep immersion. The course emphasizes scripting behaviors in C# for Unity and Blueprints or C++ for Unreal, enabling learners to implement game mechanics, user interfaces (UIs), and dynamic interactions. Physics engines are utilized to create realistic object behaviors, gravity, and collisions, while post-processing effects add cinematic depth to the experience. Learners integrate spatial audio, ambient soundscapes, and 3D voice systems to enhance realism. Projects include AR furniture visualization apps, interactive product demos, VR escape rooms, architectural walkthroughs, and virtual museum tours. The course teaches optimization techniques for performance-critical applications, including polygon reduction, occlusion culling, baked lighting, and mobile-ready rendering pipelines. Cross-platform deployment is covered, allowing learners to publish experiences to iOS, Android, Oculus Store, SteamVR, and WebXR-compatible browsers. Collaboration tools such as Git for version control and Unity Collaborate or Unreal Source Control are taught for team development. AR Cloud and persistent spatial anchoring are introduced to create multi-user AR experiences that maintain shared states across devices. Networking for multiplayer VR is also covered using Photon, Mirror, or Unreal's built-in networking APIs. Accessibility and user comfort are addressed, focusing on minimizing motion sickness, providing assistive controls, and designing intuitive interfaces. Learners also explore the ethical and psychological implications of immersive media, including user consent, behavioral influence, and digital well-being. Advanced modules introduce LiDAR scanning, depth sensing, SLAM (Simultaneous Localization and Mapping), and integration with machine learning models for object recognition and environment-aware AR. By the end of the course, learners will have created and deployed fully functional AR and VR applications with responsive user interaction, optimized performance, and cross-platform compatibility. They will be capable of designing for both utility and entertainment, with skills applicable to enterprise solutions, education, simulation, marketing, and immersive storytelling. This course is ideal for developers, 3D artists, UX designers, and innovators aiming to lead in the growing spatial computing landscape and shape how humans interact with digital content in immersive environments.