Cameras capture all the animation fun in the scene. In theory, Maya’s cameras work the same way as real cameras. The more you know about photography, the easier these concepts are to understand.
The term camera, in essence, refers to the perspective view. You can have as many cameras in the scene as you want, but it’s wise to have a camera you’re planning to render with placed to frame the shot and another camera acting as the perspective work view so you can move around your scene as you work. The original persp panel fits that latter role well, although it can be used as a render camera just as easily.
You can also render any of your work windows to test render orthogonal views of your model the same way you render a perspective ...