What is aperture:
Aperture is the adjustable lens opening that lets light into the camera when taking and image. It is important to know how to use the aperture as it determines the depth of field which controls the sharpness of the image.
A higher depth of field would allow for the whole image to be in focus with a sharp finish, and vice versa, a lower depth of field would only have a certain object in focus with the background blurry.
My examples of aperture:
