The aperture is built inside each lens and it controls the light entering a camera. It’s a lot like the shades on a window control the light. Charles Bryant created a great video clip that will teach you the basic principles of aperture.
Examples of Different Apertures
Aperture is measured in f stops. The larger the number under the f, the smaller the hole (aperture) and the less light that comes in.
If you’re interested in knowing what the “f” is about in all the aperture settings see our lesson on “Aperture F Number“.