Aperture refers to the size of the iris in the lens. It is a space through which light passes in an optical or phtotographic instrument the bigger the hole the more light gets in. it is measured in F-stops. a low number like F2.1 means a wider aperture . a small aperture would be F16. when there is a wider aperture it means less of the image is in focus . A faster shutter-speed can also be used.there are many different elements with aperture that can change an image for example
controlling light Shutter speed relates to how long the camera sensor is exposed to the light that passes through the aperture so the longer the sensor is exposed the more time the lens has to let light pass through and the shorter the sensor is exposed, the less light passes through. this creates different effects depending on whether you want an image in focus or out of focus.
wide and small aperture a wide aperture produces an image with a lot of light making an image looked washed out however this can create a purposeful effect for a related theme such as the sun. on the otherhand a small aperture will let in less light creating an image that is dark and doesnt capture as much light.
these are some of my examples below using different settings of aperture