3D building design is the process of creating detailed, three-dimensional digital models of buildings using specialized software. Unlike traditional two-dimensional blueprints, 3D design allows architects, engineers, and clients to visualize a structure from all angles, including the interior and exterior, before construction begins. These models incorporate architectural elements, materials, lighting, textures, and spatial relationships, providing a realistic representation of how the final building will look and function. 3D design enhances collaboration, identifies potential issues early, and streamlines the construction process by offering precise visualizations and accurate technical data.