Hologram

A hologram was a three-dimensional, matterless projection used by millions in the galaxy.

Operation
Holograms were used for entire representations of people or objects, all sides of which were completely visible. Unlike screens, however, holograms could not display a background; only objects within the recording's range were shown. Also unlike screens, holograms had lower quality as they often flickered and the main color of the image projected was blue and red. Though more advanced versions were full color and could be used for disguises, such as the Holographic disguise matrix.

Usage
Holograms were often used by many simply for communication, such as meetings of the Jedi Council, or by military forces to display layouts and schematics. Astromech droids were capable of performing both of these tasks with the hologram projector they were equipped with.

Holograms were also used for target practice, by the Grand Army of the Republic, for example, who would fire upon holograms of Battle droids and avoid those of Jedi.

Appearances

 * "Cat and Mouse"
 * "The Hidden Enemy"
 * Star Wars: The Clone Wars (film)
 * "Supply Lines"
 * "Ambush"
 * "Storm Over Ryloth"
 * "Innocents of Ryloth"
 * "Liberty on Ryloth"
 * "Downfall of a Droid"
 * "Duel of the Droids"
 * "Rising Malevolence"
 * "Shadow of Malevolence"
 * "Destroy Malevolence"
 * "Rookies"
 * "ARC Troopers"
 * "Cloak of Darkness"
 * "Lair of Grievous"
 * "Dooku Captured"
 * "The Gungan General"
 * "Defenders of Peace"
 * "Trespass"
 * "Blue Shadow Virus"
 * "Mystery of a Thousand Moons"
 * "Holocron Heist"
 * "Cargo of Doom"
 * "Senate Spy"
 * "Landing at Point Rain"
 * "Weapons Factory"
 * "Legacy of Terror"
 * "Brain Invaders"
 * "Grievous Intrigue"
 * "The Deserter"
 * "Lightsaber Lost"
 * "The Mandalore Plot"
 * "Voyage of Temptation"
 * "Duchess of Mandalore"
 * "Sphere of Influence"
 * "Corruption"
 * "The Academy"
 * "The Zillo Beast"
 * "The Zillo Beast Strikes Back"
 * "Death Trap"
 * "R2 Come Home"
 * "Lethal Trackdown"
 * "Evil Plans"
 * "Hostage Crisis"
 * "Heroes on Both Sides"
 * "Pursuit of Peace"
 * "Senate Murders"
 * "Nightsisters"
 * "Monster"
 * "Witches of the Mist"
 * "Overlords"
 * "Ghosts of Mortis"
 * "The Citadel"
 * "Counterattack"
 * "Citadel Rescue"
 * "Padawan Lost"
 * "Water War"
 * "Gungan Attack"
 * "Prisoners"
 * "Shadow Warrior"
 * "Mercy Mission"
 * "Nomad Droids"
 * "Darkness on Umbara"
 * "The General"
 * "Plan of Dissent"
 * "Carnage of Krell"
 * "Kidnapped"
 * "Escape from Kadavo"
 * "A Friend in Need"
 * "Deception"
 * "Friends and Enemies"
 * "The Box"
 * "Crisis on Naboo"
 * "Bounty"
 * "Brothers"
 * "Revenge"
 * "A War on Two Fronts"
 * "Front Runners"
 * "The Soft War"
 * "Tipping Points"
 * "Secret Weapons"
 * "A Sunny Day in the Void"
 * "Missing in Action"
 * "Point of No Return"
 * "Revival"
 * "Shades of Reason"
 * "The Lawless"
 * "Sabotage"
 * "The Jedi Who Knew Too Much"
 * "To Catch a Jedi"
 * "The Wrong Jedi"
 * "The Unknown"
 * "Conspiracy"
 * "Fugitive"
 * "Orders"
 * "An Old Friend"
 * "The Rise of Clovis"
 * "Crisis at the Heart"
 * "The Disappeared, Part I"
 * "The Lost One"
 * "Voices"
 * Star Wars: Darth Maul: Son of Dathomir
 * "A Death on Utapau"
 * "In Search of the Crystal"
 * "Crystal Crisis"
 * "The Big Bang"
 * Star Wars: Dark Disciple
 * "Gone with a Trace"
 * "Deal No Deal"
 * "Together Again"
 * "The Bad Batch"
 * "A Distant Echo"
 * "Unfinished Business"
 * "Old Friends Not Forgotten"
 * "The Phantom Apprentice"
 * "Shattered"
 * "Victory and Death"