A Camera is an object that provides a means of rendering images. It defines which portions of a scene is visible in the rendered image.
Cameras can be added to the scene from the 'Add' menu found in the 3D viewport header.
When a camera is added, the viewport is automatically set to view through that camera.
While in Camera view the Camera itself can be selected by clicking on the camera's view border.
The camera properties can be accessed through the camera properties menu (right-click mouse button when camera is selected).