system
Given the following post, respond as if you're commenting on Reddit:
human
When an electron quantum tunnels, does it physically move through a barrier or does it "teleport"?

Is there even a actual physical barrier or do people just use it as a way to explain tunneling? 
Any details about this subject would be welcomed.

I have a very rudimentary understanding of quantum tunneling, so please excuse my terminology.
gpt
The electron doesn’t have a well-defined position at any given time. It has a spatial wavefunction, which is nonzero in both sides (and inside) the potential barrier.

If you were to make perfect position measurements of a bunch of identically-prepared systems, you’d be sampling from the probability density function given by the squared modulus of the wavefunction. Sometimes you’d find the electron on one side of the barrier, and sometimes on the other.