Auto Focus - system uses a sensor a control system and a motor to focus fully automatic or on a manually selected point or area.
View Finder - what the photographer looks through to compose and take a image.
Shutter Speed -  is a common term used to discuss exposure time, the effective length of time a camera's shutter is open.
Angle of View - describes the angular extent of a given scene that is imaged by a camera

Aperture - is a hole or an opening through which light travels.
Shutter -  is a device that allows light to pass for a determined period of time.
Exposure - the total amount of light allowed to fall on the sensor during the taking of a photograph.
Depth of Field - the distance between the nearest and farthest objects in a scene that appear sharp in an image.
F-stop - expresses the diameter of the entrance pupil in terms of the focal length of the lens.
Focal length - measure of how strongly the system converges (focuses) or diverges (defocuses) light.