You can see your scene through different cameras and from different points of view. To see different views, you can use the predefined orthographic views or the perspective view. You can also dolly, truck, or zoom those views without affecting of the contents in the scene, including the render camera.
When using any camera, other than the render camera, zooming and panning in the Player is equivalent to dollying and trucking the camera.
The View From menu lets you access each camera and camera view, and is available from both the hardware and software renderer.