"The Camera"

     Words
>Viewfinder: a device on a camera, consisting of a lens system and sometimes a ground-glass screen, enabling the user to see what will be included in the photograph.
>lens: a piece of transparent substance, usually glass, having two opposite surfaces either both curved or one curved and one plane.
 >Rangefinder: any of various instruments for determining the distance from the observer to a particular object, as for sighting a gun or adjusting the focus of a camera.
 >Auto focus: having the ability to focus  (automatically.)

>aperture: an opening, as a hole, slit, crack, gap
>shutter: a mechanical device for opening and closing the aperture of a camera lens to expose film or the like.
>exposure: the act of exposing.
>depth of field: the range of distances along the axis of an optical instrument, usually a camera lens, through which an object produce a relatively distinct image.
>F-stop:an adjustable lens aperture, as indicated by an f number.
>focal length:the distance from a focal point of a lens or mirror to the corresponding principal plane. 

  At the top right you can see the AE/FE lock button that seconds as the index key when in Playback mode, and next to that is the AF point selection button that seconds as the magnify button when in Playback. Underneath of these two buttons is the small speaker for audio playback. To the left (right of the LCD) we can see the AV/Exposure compensation button, which allows you to switch between shutter speed and aperture values in Manual mode, or exposure compensation in Program mode. When in playback, this button acts as the delete button. Next is the Live View/Movie shooting button. Pressing this button will enter Live View mode when in a still image mode, or will Start/Stop video recording when the mode dial is set to Movie mode. Below that is the Quick Control button for the T3's shortcut menu, which is also used to access the Direct Print function while in Playback mode. To the far right of it you can see the DISPlay button, which controls the amount of information shown on the LCD screen.

Continuing on down, we have the 4-way controller, which has several jobs. These include navigating the menu system, scrolling inside an enlarged image in playback mode, and a quick recall of specific camera functions. Pressing "Up" will display the ISO settings, "Right" accesses the AF mode, "Down" gives access to the White Balance modes, and "Left" toggles the drive mode (burst/self-timer). Lastly we have the Menu and Play buttons at the bottom.