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SISD is short for **Single Instruction/Single Data** which is one [classification of computer architectures](https://en.wikipedia.org/wiki/Flynn%27s_taxonomy). In SISD architecture, a single processor executes a single instruction and operates on a single data point in memory.
See also {{Glossary("SIMD")}} for a parallel architecture that allows one same operation to be performed on multiple data points.
## See also
-[SISD](https://en.wikipedia.org/wiki/Single_instruction,_single_data) on Wikipedia