X Program (Xプログラム X Puroguramu), also known as Digimon Elimination Program (デジモン消去プログラム Dejimon shōkyo puroguramu) and Particle Worm (粒子化ワーム Ryūshi-ka wāmu), is a program created by the host computer Yggdrasill in the year 2003 in order to optimize its own capacity during the Project Ark. This program was made to systematically delete every single Digimon but can also be used to forcibly remove foreign molecules and purify the Digital World, as used in Digimon World Re:Digitize Decode to expel Vitium from the Digital World. During the events of Digimon Chronicle, the X Program was used to delete Digimon overpopulating the Old Digital World of the Old Digital World, but strong enough Digimon resisted the effects of the X Program and were able to survive by altering their Digicores. These Digimon were reborn in a form that incorporates the X Program itself into their Digicore and thus created the X-Antibody, an antibody that grants resistence to the X Program. Also, as shown in Digimon Chronicle X, after being released, the concentration of X-Program will naturally decrease over time.
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