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That refers to the maximum aperture of a lens.
Inside the lens, a diaphragm can be contracted or kept open to restrict or allow light to hit the sensor/film

It can be confusing because the setting that allows the most light in is the smallest f stop, and the setting that allows the least amount of light is the highest number.


A larger aperture lets in more light which means you can use faster shutter speeds in low light to avoid shake and blur.

The aperture also determines the depth of field, which is basically whether you have a very thin area of focus - like a portrait where the eyes are super sharp, but blurring is starting to occur at the tip of the nose and the ears. - or a very wide depth of field - like a landscape shot where the grass in the foreground and the mountains in the background are both in focus.

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