Plagiarism is presenting another's words, analysis, interpretation or other work as your own. It is intellectual theft, academically dishonest, compromises your reputation and jeopardizes your college career.
Plagiarism is not the same thing as copyright violation. Violating copyright is a legal concept, plagiarism is an ethical concept; you can commit plagiarism without violating copyright and, you can violate copyright without committing plagiarism.
Reuse of your own content such as text, charts or graphs, without attribution. This is considered plagiarism because it does not credit the original source and misleads readers into believing this new, original, content.
Source: "What Is Plagiarism," University of Notre Dame Libraries, https://libguides.library.nd.edu/plagiarism
Digital content makes it easy to accidently plagiarize by using copy/paste then forgetting to provide attribution. Organizing your research will not only help you complete your assignments, it will help you avoid plagiarism.
Adapted from "Avoiding Plagiarism," University of Notre Dame Libraries, https://libguides.library.nd.edu/plagiarism