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The WFPC2 was installed in the Hubble Space Telescope (HST) in December 1993. Since then, a significant amount of calibration data has been collected to aid in the understanding of the on-orbit performance of the instrument. This paper will present some of the information learned on-orbit, including a description of WFPC2 image quality, throughput and photometric performance of the instrument, CCD characteristics as observed in the HST environment, and a review of standard calibration procedures for the WFPC2 user. This is an update of recent journal articles which have detailed the on-orbit calibration of WFPC2.