The LHCb experiment relies heavily on the silicon microstrip detector, the VELO, which will be used to trigger on B decay vertices and reconstruct them with micrometric accuracy. While relatively small in size, comprising just 84 modules, the VELO construction poses special challenges due to the high accuracy required and the proximity to the LHC beams. The detector will be required to operate under vacuum and will be exposed to high radiation levels. This talk will review all aspects of the detector implementation (Si sensors, front-end electronics, cooling, mechanical integration into the LHC machine vacuum) as well as the expected performance based on our latest laboratory and test-beam measurements.