AbstractThe Silicon Detector (SiD) is a collider detector concept based on all-silicon tracking and a silicon-tungsten sampling calorimeter, complemented by a powerful silicon pixel vertex detector, a hadronic calorimeter contained within the solenoidal magnet and an instrumented flux return functioning as the muon system. Optimized forward detectors are deployed to ensure hermiticity and provide luminosity measurements. In order to meet the International Linear Collider (ILC) physics goals, we have designed a general purpose detector taking full advantage of the silicon technology. The silicon detector is performant, robust against machine-induced background and, by now, a mature concept.