A “regular” camera with a fixed lens has a bigger lens which can move.
The movement of the lens is to create wider or more zoomed in images.
Regular camera’s also can change the lenses inside to create a macro effect.
Interchangable lens camera’s can fit any lens they want to create the image the photographer wants.
The tiny thin lenses on the phone can’t make these movements so the 3 camera’s are usually wide angle, standard angle and macro.
The zoom part of the phone is just digital zoom.
It doesn’t make it better, it just provides different options of photography in your phone which it can’t do when you only have 1 camera on it.
All are equally bad compared to camera’s with bigger lenses and sensors.
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