The significance of AR in app development lies in its ability to enhance user engagement and interactivity by blending digital elements with the real world. This immersive experience allows developers to create applications that can improve learning, entertainment, and even retail experiences. By overlaying information or interactive features onto physical surroundings, AR applications can provide users with contextual information, enhancing problem-solving and creativity. As technology continues to evolve, AR's potential to influence user behavior and expectations in app development will grow, fostering innovative uses across various sectors.