This document provides an overview of plagiarism, including what it is, why it is important to avoid, and how to properly cite sources to prevent plagiarism. Plagiarism is defined as passing off someone else's work as your own by not giving proper credit or citation. It is considered theft and cheating. The document discusses how to properly paraphrase and quote sources, as well as what constitutes common knowledge versus information that requires citation. Examples are given of both proper and improper paraphrasing. The key messages are that all ideas from an external source, even if reworded or translated, require citation to avoid plagiarism.