According to the U.S. Department of Health and Human Services Office of Research Integrity (ORI), plagiarism is taking or misusing someone else's intellectual property (https://ori.hhs.gov/ori-policy-plagiarism).
APA Style on the "Plagiarism" page (https://apastyle.apa.org/style-grammar-guidelines/citations/plagiarism) defines plagiarism as "presenting the words, ideas, or images of another as your own." Writers are reminded that:
The APA page also introduces the dread topic of self-plagiarism. This may seem impossible but isn't. Remember:
To avoid plagiarism, give appropriate credit to the source of the intellectual property (concept, words, graphical material) you use in your work. That means that you:
As part of avoiding plagiarism, a writer uses what someone else has written --- with credit given --- but restates it. It may help you to think of this as a challenge (in a good way). You want to show that you understand what the first author wrote and then help others understand.
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