3D Viewer is a built-in app on Windows 10 that allows you to view 3D models and animations. Whether you need it on your computer depends on your usage and preferences. If you work with 3D models, animations, or design software, having 3D Viewer can be beneficial. It allows you to easily view and manipulate 3D objects, making it a handy tool for professionals in industries like architecture, engineering, and game development. Additionally, if you enjoy exploring 3D content or want to view 3D images and models for entertainment purposes, 3D Viewer can enhance your experience on Windows 10. On the other hand, if you don't work with 3D content or have no interest in exploring 3D models, you may not need to have 3D Viewer on your computer. It's also worth noting that 3D Viewer is not a resource-intensive app, so it won't significantly affect your computer's performance by being installed. Ultimately, the decision to have 3D Viewer on Windows 10 depends on your specific needs and interests related to 3D content. If you decide to have it, you can easily access and use it through the Start menu or by opening 3D models with the app. If you don't have it, you can always install it from the Microsoft Store whenever you feel the need for it in the future.