Aperture, Shutter Speed, ISO Sensitivity

“ Aperture ”
APERTURE is referred to the lens diaphragm opening inside a photographic lens
A “small” aperture means a small hole, but a big number, like f11. Small apertures (small hole, big number) have deep depths of field, meaning more sharpness around the subject.  You can see more examples of this below.	A “big” aperture means a big hole, but a small number, like f2.8. Large apertures (big hole, small number) have shallow depths of field, meaning more blurriness around the subject.
Example of small aperture: F16	Example of large aperture: F2.8
“ Shutter Speed ” SHUTTER SPEED  is the amount of time that the shutter is open. It also affects the amount of light that hits the sensor.
The faster the shutter speed, the less light that comes into the camera. A fast shutter speed would be something like 1/2000th of a second. The faster the shutter speed the better the camera will freeze the action of an event.	Then slower the shutter speed, the more light will enter into the camera. A slow shutter speed would be 1/30th  of a second. In slow shutter speed the subject will be blurred as it passes across the viewfinder and the background will be sharp.
Example of fast shutter speed : 1/1500th	Example of slow shutter speed : 1/30th
“ ISO Sensitivity ” ISO measures the sensitivity of the image sensor. It was measured in numbers like 100, 200, 400, 800 etc.
The lower the number the lower the sensitivity of the sensor toward light. Like ISO 100 and 200 . Lower ISO numbers require more light to get a good exposure. A lower ISO setting is preferred whenever possible since it helps to reduce this noise or grain.	The higher the number the higher the sensitivity of sensor toward light like ISO 800 and 1600. Higher ISO numbers require less light to get the right exposure. The higher the ISO increases the noise level of the image (In film this is often referred to as "grain")
Example of Low ISO : 100	Example of High ISO: 800
Example of finer grain in ISO 100	Example of grain (noise) in ISO 800