XR, AR, VR, MR: What’s the Difference in Reality?

eXtended Reality (XR) is a term for technologies that enhance or replace our view of the world. This is often done by overlaying or immersing digital information and graphics into real-world and virtual environments, or even a combination of both, a process also known as spatial computing. 

XR encompasses augmented reality (AR), virtual reality (VR), and mixed reality (MR). While all three ‘realities’ share overlapping features and requirements, each technology has different purposes and underlying technologies. 

XR is set to play a fundamental role in the evolution of personal devices and immersive experiences, from being a companion device to smartphones to standalone Arm-powered wearable devices, such as a VR headset or pair of AR smartglasses where real, digital and virtual worlds converge into new realities for the user.  

While XR devices vary based on the type of AR, MR, and VR experiences and the complexity of the use cases that they are designed to enable, the actual technologies share some fundamental similarities. A core part of all XR wearable devices is the ability to use input methods, such as object, gesture, and gaze tracking, to navigate the world and display context-sensitive information. Depth perception and mapping are also enabled through the depth and location features.  

What are the advantages and challenges with XR?

XR technologies offer several advantages compared to other devices, including:  

• Enhanced interaction through more natural and intuitive user interfaces;  
• More realistic simulations for training and education;  
• Increased productivity with virtual workspaces and remote collaboration;  
• More immersive entertainment experiences; and  
• Alternative interaction methods for people with disabilities.  

However, there are still challenges that need to be overcome with XR devices. These include:  

• The initial perception around bulky and uncomfortable hardware.  
• Limited battery life for untethered devices.  
• Complex and resource-intensive content creation.  
• The need for low latency, and high performance.
• Ensuring data privacy and security for the end-user. 

What is augmented reality (AR)?

Augmented Reality enhances our view of the real world by overlaying what we see with computer-generated information. Today, this technology is prevalent in smartphone AR applications that require the user to hold their phone in front of them. By taking the image from the camera and processing it in real time, the app can display contextual information or deliver gaming and social experiences that appear to be rooted in the real world. 

Smartphone AR has improved significantly in the past decade, with some great examples being Snapchat where users can apply real-time face filters via AR, and IKEA place where users can visualize furniture in their homes through AR before making a purchase. However, the breadth of these applications remains limited. Increasingly, the focus is on delivering a more holistic AR experience through wearable smart glasses. These devices must combine an ultra-low-power processor with multiple sensors, including depth perception and tracking, all within a form factor that is light and comfortable enough to wear for long periods. 

AR smart glasses need always-on, intuitive, and secure navigation while users are on the move. This requires key advancements in features such as depth, 3D SLAM, semantics, location, orientation, position, pose, object recognition, audio services, and gesture and eye tracking. 

All these advancements and features will require supporting AI and machine learning (ML) capabilities on top of traditional computer vision (CV). In fact, new compact language models, which are designed to run efficiently on smaller devices, are becoming more influential across XR wearable technologies. These models enable real-time language processing and interaction, which means XR wearable devices can understand and respond to natural language in real time, allowing users to interact with XR applications using real-time voice commands.  

Since 2021, several smart glasses models have arrived on the market, including the Spectacle smartglasses from Snap, Lenovo ThinkReality A3, and in 2024, the Ray-Ban Meta Smart Glasses, Amazon Echo Frames, and, most recently, Meta’s Orion smartglasses. All of the devices are examples of how XR wearables are evolving to provide enhanced capabilities and features, like advanced AR displays and real-time AI video processing. 

What is virtual reality (VR)?

VR completely replaces a user’s view, immersing them within a computer-generated virtual environment. This type of XR technology has existed for a while, with gradual improvements over the years. It is used primarily for entertainment experiences, such as gaming, concerts, films, or sports but it’s also accelerating into the social domain. For VR, the immersive entertainment experiences will require capabilities like an HD rendering pipeline, volumetric capture, 6DoF motion tracking, and facial expression capture. 

VR is also used as a tool for training and in education and healthcare, such as rehabilitation. To make these experiences possible (and seamless) for the end-user, the focus of VR technology is often on high-quality video and rendering and ultra-low latency. 

Finally, VR devices started enhancing video conferencing experiences through platforms like Meta’s Horizon Workrooms that enable virtual meet-ups in different virtual worlds.  

Standalone VR devices, such as the latest Meta Quest 3, can deliver AAA gaming and online virtual worlds experiences. Powered by high-end Arm processors, these standalone VR devices can be taken anywhere.  

What is mixed Reality (MR)?

MR sits somewhere between AR and VR, as it merges the real and virtual worlds. There are three key scenarios for this type of XR technology. The first is through a smartphone or AR wearable device with virtual objects and characters superimposed into real-world environments, or potentially vice versa. 

The Pokémon Go mobile game, which took the world by storm back in 2016, overlays virtual Pokémon in real-world environments via a smartphone camera. This is often touted as a revolutionary AR game, but it’s actually a great example of MR – blending real-world environments with computer-generated objects. 

MR is revolutionizing the way we experience video games by enabling the integration of real-world players into virtual environments. This technology allows VR users to be superimposed into video games, creating a seamless blend of physical and digital worlds. As a result, real-world personalities can now interact within the game itself, enhancing the immersive experience for both players and viewers. 

This innovation is particularly impactful for streaming platforms like Twitch and YouTube. Streamers can now bring their unique personalities directly into the game, offering a more engaging and interactive experience for their audience. Viewers can watch their favorite streamers navigate virtual worlds as if they were part of the game, blurring the lines between reality and the digital realm. By incorporating MR, streamers can create more dynamic and visually captivating content, attracting larger audiences and fostering a deeper connection with their fans. This technology not only enhances the entertainment value but also opens up new possibilities for creative expression and storytelling in the gaming community.

XR is becoming more mainstream

With more XR devices entering the market, XR is becoming more affordable, with the technology transitioning from tech enthusiasts to mainstream consumers. 

XR is increasing the immersive experience, by adding more sensory inputs, integrating with more wearable technologies, and using generative AI to create faster and more realistic and interactive virtual environments for collaboration and meeting spaces, such as the Meta Horizon OS that will provide workspaces for regular work. This makes XR technologies more accessible and universally adopted in more markets beyond gaming, including: 

• Education e.g. Immersive simulation, exploring historical events virtually, virtual experiments, and augmenting museum tours 
• Healthcare e.g. More realistic medical training, removing the need for physical consultations, therapeutic applications, and AR-assisted surgeries 
• Retail: e.g. Virtual clothes fittings, product visualization, virtual shopping tours. 
• Industrial: e.g. Interactive training programs. 

XR is continuously evolving, increasingly at a faster pace thanks to the support of AI. This offers new ways to blur the frontier between virtual and physical worlds. 

Advancing XR Experiences 

Arm focuses on developing technology innovations that power the next generation of XR devices. Arm CPU and GPU technology delivers many benefits:   

• Efficient performance: Arm’s leadership in high-performance, low-power specialized processors is ideal for XR experiences. This includes the Cortex-X and Cortex-A CPUs as part of the new Arm Compute Subsystem (CSS) for Client that can be used in silicon solutions for wearables and mobile devices, providing the necessary compute capabilities for immersive XR experiences. These can also be combined with accelerator technologies like Ethos-U NPUs that can with Cortex-A-based systems to deliver accelerated AI performance. 
• Graphics capabilities: Arm’s Immortalis and Mali GPUs deliver exceptional graphics performance and efficiency for XR gaming experiences. 
• Real-Time 3D Technology: The pivot to more visually immersive real-time 3D mobile gaming content is at the heart of the Immortalis GPU. This technology brings ray tracing and variable rate shading to deliver more realistic mobile real-time 3D experiences. 
• Security and AI: Arm’s built-in technology features for security and AI are essential for the ongoing development of next-generation XR devices. 
• Strong software foundations: In many instances, companies that are developing XR applications are using versions of the Android Open Source Project as their base software. This ensures that they benefit from years of software investment from Arm, allowing their software enablement efforts to scale across a wide range of XR devices. 

Through the Arm Compute Platform, we are providing a performant, efficient, secure, and highly accessible solution with advanced AI capabilities that meet the needs of XR devices and experiences, now and in the future. Recent technology developments have shown that mainstream XR could be coming soon, with Arm’s technologies ideally placed to deliver truly immersive experiences for this next future of computing.