The article provides an overview of the LHCb detector, which is dedicated to precision measurements of CP violation and rare decays of B hadrons at the Large Hadron Collider (LHC) at CERN. The detector's initial configuration and expected performance are described, including its layout, front-end electronics, interface to the LHC machine, spectrometer magnet, tracking system, particle identification, trigger, and online systems. The front-end electronics architecture is designed to handle a high trigger rate, with a first-level trigger capable of reducing event rates by a factor of 10. The detector's components, such as the vertex locator system (VELO), silicon tracker, outer tracker, Ring Imaging Cherenkov counters (RICH), calorimeters, and muon system, are detailed. The article also discusses the radiation tolerance of the electronics and the design of the beampipe and vacuum chamber to maximize transparency in the critical regions. Additionally, the Beam Conditions Monitor (BCM) system is introduced to protect the tracking devices from adverse LHC beam conditions.The article provides an overview of the LHCb detector, which is dedicated to precision measurements of CP violation and rare decays of B hadrons at the Large Hadron Collider (LHC) at CERN. The detector's initial configuration and expected performance are described, including its layout, front-end electronics, interface to the LHC machine, spectrometer magnet, tracking system, particle identification, trigger, and online systems. The front-end electronics architecture is designed to handle a high trigger rate, with a first-level trigger capable of reducing event rates by a factor of 10. The detector's components, such as the vertex locator system (VELO), silicon tracker, outer tracker, Ring Imaging Cherenkov counters (RICH), calorimeters, and muon system, are detailed. The article also discusses the radiation tolerance of the electronics and the design of the beampipe and vacuum chamber to maximize transparency in the critical regions. Additionally, the Beam Conditions Monitor (BCM) system is introduced to protect the tracking devices from adverse LHC beam conditions.