system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do touch screens work?
gpt
Basically most touchscreens consist of a few basic parts.

1)The glass, or sometimes plastic top layer, this is just a nice surface it by design does not do much of anything.

2)The display, this is the screen it shows stuff. This is more or less like any screen, again not real touchy function here.

3) The digitizer.

The digitizer is where all the magic happens and the technology to accurately measure and collect multiple touch points at once is pretty complex. However the basic premise is pretty simple.

A uniform current of electricity is sent across the digitizer. When you touch the digitizer your finger disrupts this a causes that otherwise uniform flow not to be uniform in the place where it is touched. This raw information on the state of this electrical current across the digitizer is sent a computer which takes this info and tries to turn it into touches and gestures.