Today, I leant a few new terms which confused me for a long time. I hope that also would be useful for you.

1. ISO is a short for International Standards Organization, an organization that defines standards. ISO speed is a term for expressing the light sensitivity of a digital camera. Just explain it in a simple way that the higher ISO speed, the dimmer the light which you can take picture.

Generally, people prefer to shoot landscapes and general photography in ISO 100-200; in nighttime or dim interiors where flash is not an option then can choose from 400-1600.

2. SLR (Single Lens Reflex) In general, it is a kind of more expensive interchangeable-lens camera that allows viewing though the lens.

3. Shutter speed The length the camera shoot the side that creates shadows and highlights can reveal significant amounts of details.