In 3D there are many ways you can change your view. The easiest way is to use one of the standard views - top, bottom, isometric, etc.
See 3D Views.
Other tools for view manipulation include:
Camera movements: Incremental controls for adjusting the camera, and therefore your view of the model. See Camera Movements.
Walk Through tools: Used to dynamically move the camera, presenting a moving viewpoint. See Walk Through Tools.
Camera objects: Used to create and save views with specific parameters. The view for each camera object can be displayed in a separate window. See Camera Objects.
Rendering: Enables you to see your 3D model as shaded. Certain render modes also enable you to view texture and materials. See Render Styles.