system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why professional cameras are so big in comparison with a cellphone that also take pictures? What are the advantages of being bigger in size?
gpt
A bigger piece of glass collects more light, giving the camera more information to work with.  A bigger sensor collects more data points per frame.  A better sensor (because it doesn't have to be tiny) collects data with less noise.  Bigger cameras also allow interchangeable lenses, optical filters, moving glass elements for optical zoom, motor controlled glass elements for vibration reduction, optical aperture control to control the amount of light going into the camera, shutter speed control to manage depth of field and motion blur, more space for controls, bigger batteries, higher energy flash, and other features.