They claim to have teleported a laser beam from one part of a room to another.
Teleporting is when an object is made to disappear from one place and reappear in another.
Beam me up
If you've seen Star Trek, that's the "Beam me up" part!
It means in theory space and time wouldn't matter any more if you were trying to get somewhere.
But teleporting humans is a REALLY long way off.
Every single one of the trillions of atoms that make up your body would have to be figured out first.
In reality, it will probably be used to send data much faster.