What's the difference between mobile phone photography and SLR photography?

There is a big difference between mobile phone photography and SLR photography. The first and most important difference. Due to the limitation of volume, the image sensor of mobile phone is much smaller than that of SLR photography. In addition, the mobile phone only has a fixed photographic lens, which is very small, and the SLR can replace the fixed focus or zoom lens with different apertures, which determines that the image quality of SLR photography is obviously better than that of mobile phone photography.