An adjustable opening on a digital camera used to control the amount of light coming through the lens. The more the Iris opens, the more light is let in and the brighter the scene will be.
Shutter Speed
https://photographylife.com/what-is-shutter-speed-in-photography
The length of time a camera shutter is open to expose light to the camera sensor. If the shutter speed is fast the action is frozen completely, creating a sharp motion shot. If the shutter speed is slow it can create an effect called motion blur- where moving objects appear blurred along the direction of motion. This effect is used quite a bit in advertisements of cars and motorbikes, where a sense of speed and motion is communicated to the viewer by intentionally blurring the moving wheels.
ISO
When you change your ISO setting, you're changing your cameras sensitivity to light. A low setting makes it less sensitive and a high setting makes it more so, the ISO number is found on the box and canister of the camera. A higher ISO usually translates to a noisy or "grainy" image, so as a general rule you should use the lowest possible setting for your photos, but there are situations where a higher ISO setting is desirable.
Depth of Field
The distance between nearest and furthest objects giving a focused image. Some images have very small depths of field which is called shallow depth of field, others will have a very large zone of focus which is called a deep depth of field. The closer the subject is to the camera, the shallower your depth of field becomes. Moving further away from the subject will deepen your depth of field. Depth of field is also effected by focal length of a lens control and aperture.
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