Aperture explained

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What is Aperture
 Aperture is one third of the exposure triangle, the others being the shutter speed and iso.  It  is the opening inside your lens, light travels through that opening to your camera sensor.  Aperture affects  exposure and depth of field.

 Aperture can expand on contract, it is  represented by f-stops / f number. The smaller the f-stop number is the wider the Aperture,  more  light enters the camera. The larger the f-stop the smaller the Aperture, Less light enters the camera, 
when you change your f-stop number it affects the exposure.
 





Aperture affects your depth of field, a smaller  f- stop number gives you a shallow depth of field, the  background is blurry.
A larger f-stop gives you a sharper depth of field, background is in focus 

When would you use a shallow depth of field  vs a sharper depth of field.

If you are taking a portrait and you want that classic portrait look with the background out of focus then you would use a small f-stop, wider Aperture.
For landscape photos you would use a larger f-stop number because you want everything to be in fucus.


CONCLUSION
Having a better understanding of Aperture will improve you photography dramatically, so go out there and shoot.

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