AgInSbTe, or Silver-Indium-Antimony-Tellurium, is a phase change material from the group of chalcogenide glasses, used in rewritable optical discs (such as rewritable CDs) and phase-change memory applications. It is a quaternary compound of silver, indium, antimony, and tellurium. Another similar material is GeSbTe, offering a lower linear density, but with higher overwrite cycles by 1-2 orders of magnitude. It is used in pit-and-groove recording formats, often in rewritable DVDs.