Aperture is simply the hole in the centre of the lens that allows light to enter through to access the sensor.
The numbers on the lens are a method of knowing what size the aperture is lenses all have different apertures allowing each lens to be able to give a totally different image.
DEPTH OF FIELD
Depth of field refers to how much of the image is in focus which is the are that is in a sharp view compared to the rest of the image.
Using depth of field allows the photographer to be able to make the viewer of their creation focus on the area of the image that they actually wont them to view.
Images are sourced from google
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