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{{redirect|SIESTA|other uses|Siesta (disambiguation)}}
'''SIESTA''' ('''Spanish Initiative for Electronic Simulations with Thousands of Atoms''') is an original method and its computer program implementation, to perform efficient [[electronic structure]] calculations and [[ab initio]] [[molecular dynamics]] simulations of [[molecules]] and solids. SIESTA's efficiency stems from the use of strictly localized basis sets and from the implementation of linear-scaling algorithms which can be applied to suitable systems. A very important feature of the code is that its accuracy and cost can be tuned in a wide range, from quick exploratory calculations to highly accurate simulations matching the quality of other approaches, such as plane-wave and all-electron methods.
SIESTA is the [[backronym]] of Spanish Initiative for Electronic Simulations with Thousands of Atoms.
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