Paper recycling is the process of recovering waste paper an remaking it into new paper products. There are three categories of paper that can be used as feedstocks for making recycled paper: mill broke, pre-consumer waste, and post-consumer waste. Mill broke is paper trimmings and other paper scrap from the manufacture of paper, and is recycled internally in a paper mill. Pre-consumer waste is material that was discarded before it was ready for consumer use. Post-consumer waste is material discarded after consumer use, including OM (old magazines), OTD (old telephone directories), and RMP (residential mixed paper). Paper suitable for recycling is called "scrap paper".