Okay, kiddo, so technology demonstration is when someone shows how a new thing works. Let's say your mommy wants to show you a new toy robot. She will press some buttons or use a remote control to make the robot move, play sounds or lights up. That's a simple technology demonstration.
Now imagine that scientists and engineers made a new robot that can detect earthquakes before they happen. This is a very complicated thing, and they want to show it to people to prove it works. So they will have to demonstrate the technology.
They might take the earthquake-detecting robot to a place where they know seismic activity happens, like near a volcano. They will set up the robot and wait for an earthquake to happen. When the robot senses the movement, it will send a signal to a computer or smartphone, and an alert will go off, saying "Earthquake detected!".
That's a technology demonstration. It's a way for people to see how new technology works, what it can do, and how it can help us in different ways. When people see a technology demonstration, they can decide if they want to buy it, fund it, or use it in their work.