Augmented reality (AR) and virtual reality (VR) can benefit urban planning and interior design in several ways. AR allows urban planners to visualize big data by creating 3D representations of infrastructure changes to analyze impacts. It also encourages citizen participation by providing realistic previews of development projects. VR can turn cities into smart cities by enabling citizens to interact with local authorities and access public services virtually. For interior design, AR and VR allow designers and clients to place virtual furniture and see realistic previews of room designs, helping reduce errors and costs. Both technologies improve communication of design ideas between designers and clients.