How on earth do touchscreens work?

[Thankyou4calling]

I find it amazing that I can touch something on say my Iphone, the info is stored in my fingertip and when i touch something else on the phone my fingertip discharges that information!

It's amazing.

Now I know it can't be in my fingertip but where is it/How does it happen?

[Thankyou4calling]

I really would like to know in laymans terms how it works

https://www.youtube.com/watch?v=y_6n3Q0GyKM