The defining characteristics of augmented reality (AR) apps include the integration of digital content with the real world, interactive elements, and real-time functionality. AR apps utilize a device's camera and sensors to overlay graphics, sounds, or other data onto the physical environment. This creates immersive experiences, allowing users to engage with their surroundings in innovative ways. Key applications of AR can be found in gaming, education, and retail, where they enhance user experience and provide additional information about real-world objects and environments.