The Hubble Source Catalog (HSC) is designed to optimize science from the Hubble Space Telescope by combining the tens of thousands visit-based source lists in the Hubble Legacy Archive (HLA) into a single master catalog. The HSC Summary search displays a single row entry for each object, as defined by a set of detections that have been cross-matched and hence are believed to be a single object. Averaged values for magnitudes and other relevant parameters are provided. The catalog currently contains over 16 million entries.