pixels:a minute area of illumination on a display screen, one of many from which an image is composed

image resolution: How clear the photo comes out

 megabyte- a type of storage place.

megapixel: a graphic resolution
 gigabyte: equals one billion

jpeg:a format to compress images

psd: photoshop file
white balance: colour balance in a camera.

Histogram: a diagram consisting of rectangles whose area is proportional to the frequency of a variable and whose width is equal to the class interval.

Aperture:the aperture size will regulate the film's or image sensor's degree of exposure to light.

Shutter Speed:is the length of time when the film or digital sensor inside the camera is exposed to light

Depth of Field:Depth of field refers to the range of distance that appears acceptably sharp

Bitmap:Images acquired by digital cameras, digital camcorders and scanners 

Exposure: the unit of measurement for the total amount of light permitted to reach the electronic sensor during the process of taking a photograph.

Watermaking: faint imprints on paper that could only be seen at a specific angle

Optical Zoom: Changing the focal length of a camera by adjusting the physical zoom lens

Digital Zoom: is a function of a digital camera used to make the image seem more close-up

Image stabilization: the apparatus, contained within a digital camera or other digital recording device, that compensates in real-time for shaking and vibrating while recording.

noise: describe visual distortion

lag time:  refers only to shutter effects, but more broadly refers to alllag between when the shutter button is pressed and when the photo is taken, including metering and focus lag

Hot shoe: a bracket on a camera body that provides support and electrical contact for an electronic flash attachmen

fisheye: an ultra wide-angle lens that produces strong visual distortion intended to create a wide panoramic or hemispherical image.

macro:  a lens having a reproduction ratio of 1:1 on the film or sensor plane

telephoto: a specific type of a long-focus lens in which the physical length of the lens is shorter than the focal length.

wide angle: refers to a low magnification lens that is able to direct a wide view of a scene to the camera's image sensor.

DSLR: combining the optics and the mechanisms of a single-lens reflex camera with a digital imaging sensor, as opposed to photographic film.