Exposure
What is Exposure?
In photography, exposure is the amount of light per unit area.
The “exposure triangle” is about how 3 things — aperture, shutter speed and ISO you need the to have the right components for a perfect exposure.
This image is too dark, not a lot of light is let in which makes it Underexposed and if you let in too much light it'll be (over exposed)this can be sorted by sorting out the aperture .
This image is highly overexposed which affects the qaulity of the photo because the photo ends up looking ' washed out '