The holographic postcard was a device that could be used to send holographic messages. The holographic messages were recorded and transmitted as a three dimensional holographic image. The holographic image looked like a three dimensional video message.

In 2009, Clyde Langer and Luke Smith used it to send video messages to Maria Jackson in Washington DC. Clyder Langer also showed his father the holographic postcard. (TV: The Mark of the Berserker)

Maria and her father Alan Jackson could not come to Luke's second farewell party, but sent a holographic message over from America. For Luke, it was like they were actually there. (PROSE: The Nightmare Man)

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