This document defines and discusses plagiarism. It notes that plagiarism involves presenting others' work as one's own, whether intentionally or unintentionally through carelessness. Examples are provided of politicians, historians and journalists who faced consequences for plagiarism, such as losing their jobs. The document emphasizes that plagiarism is a form of theft and cheating, and stresses the importance of properly citing sources and putting information in one's own words through strategies like quoting, paraphrasing and summarizing.