The aperture impacts the brightness and depth of your image. This refers to how much of your image is in focus, or how distant an item is in the image before it’s out of focus. An image with a shallow depth of field will have less of the foreground area in focus, and less of the background area in focus, which means your central point of focus will appear sharper in comparison to the foreground and background. On the other hand, an image with a deep depth of field will have much more of the image in focus, from the main focal point — such as your subject -- to the background.
As we mentioned before, adjusting the aperture will let in more or less light depending on whether you make the hole smaller or larger. To end up with a well-exposed image, you’ll need to play around with your shutter speed and ISO to match.
Next, aperture settings are presented in designated numbers known as f/stops. And here’s where it gets tricky: a smaller number, such as f1.4, is actually a larger aperture (or hole), while a larger number, like f16, is a smaller hole so it lets in less light.