Warp Pad

A "Warp Pad" is a device used to teleport Gems to other locations. It was first seen in the "Pilot".

About
Warp pads, as far as we know, keeps you in the same world since Steven and the Crystal Gems had to swim back from the Lunar Sea Spire. Sugilite also had to swim/walk back from the Communications Hub. In the episode "Space Race", the Galaxy Warp is shown, a location that is filled with broken warp pads that had once lead to different places off planet, suggesting that no known warp pads on Earth go anywhere else besides a location on Earth itself. "Winter Forecast" suggests that with enough focus, a small group of Gems in a circle can warp an object on its own to another location without warping themselves.

Warp pads can become destroyed by weighted objects, as seen in "Coach Steven", when a boulder fell, and was smashed into a warp pad, and as a result, Pearl could not warp back to the Communications Hub. The Flask Robonoids were also revealed to be strong enough to chip them. Warp pads can also become damaged to a point where they don't work, as all the warp pads at the Galaxy Warp were damaged by unknown means and all of them are shown as inactive.

Trivia

 * A Warp Whistle can be used to activate warp pads, as shown in "House Guest".
 * Steven is revealed to be able to warp on his own in "House Guest". He becomes proficient enough at it to warp others with him by the time of "Island Adventure".
 * Steven gets a glimpse of what it is like outside a warp stream in "Warp Tour", which is like a void with other warp streams going towards a single point.
 * Its also revealed that its cold and airless outside warp streams, like all other voids.
 * Flask Robonoids contain a special liquid that can repair warp pads.
 * It is slightly apparent that if a warp pad has the slightest chip or crack in it, it will cease to function, thus rendering it "Inactive"