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BABAR is the detector for the SLAC PEP-II asymmetric e+e-B Factory operating at the (4S) resonance. BABAR was designed to perform comprehensive studies of CP-violation in B-meson decays. The BABAR detector has many subsystems configured around a beryllium beam pipe. Charged particle tracks are measured in a multilayer silicon vertex tracker surrounded by a cylindrical wire drift chamber. Electromagnetic showers from electrons and photons are detected in an array of CsI crystals located just inside the solenoidal coil of a superconducting magnet. Muons and neutral hadrons are identified by arrays of resistive plate chambers inserted into gaps in the iron flux return of the magnet. Charged hadrons are identified by dE= dx measurements in the tracking detectors and in a quartz ring-imaging Cherenkov detector surrounding the drift chamber. The trigger, data acquisition and data-monitoring systems are VME-and network-based, and controlled and operated by custom-designed on-line software. Details of the design and layout of the detector components and their associated electronics and software are presented together with performance data.