Stargate

Allowed for near-instantaneous transportation between two distant points in space

When an address is inputted, the dialing gate connects to the receiving gate;

A one way wormhole between the two gates was established

Travelers were dematerialized, transported through it & reassembled on the other side

Stargates within a galaxy were linked to each other in a network, by DHD

If used with a ZPM, gates could connect to other Galaxies