The key technology for developing augmented reality (AR) experiences includes computer vision, depth tracking, and 3D modeling. These technologies work together to overlay digital information onto the real world in a coherent way. AR systems utilize sensors and cameras to capture the user's environment and detect surfaces, while software algorithms process this information to render 3D virtual objects accurately. Additionally, user interfaces and interaction design play vital roles in creating intuitive and immersive AR experiences. Overall, these technologies enable innovative applications across various fields, from gaming to education and training.