We pretty much all use a camera these days even if it’s the one in your mobile phone.
The slowmoguys using their Phantom Flex high speed camera at 10.000 fps unravel the mysteries of rolling/global shutter, duration of exposure, shutterspeed and the intricasies of filming fast motion and slow motion and more.
The same principles apply for electronic rolling shutters in things like mobile phones and why you may have noticed vertical objects like poles have a slight slant away from true verticle.
Using a very high speed camera filming at 10,000 fps we can see all the internal operations of a typical DSLR camera.
This tech helps to explain the principles in a very simple way – you can see whats happening.