What Is Plagiarism? Types, Examples, and How to Avoid It
Understand direct, accidental, mosaic, and self-plagiarism, plus practical ways to cite and review your work before submission.
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Plagiarism is a problem of attribution
Plagiarism happens when someone presents another person's words, ideas, structure, or creative work as their own without appropriate acknowledgment. It can be deliberate, but it can also happen when notes, citations, or paraphrases are handled too quickly.
A plagiarism check is most useful as a review step. A similarity result points you toward passages that deserve attention; it is not, by itself, a final judgment about intent.
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Common types of plagiarism
Different forms of plagiarism require different fixes.
Direct plagiarism copies wording without quotation marks and a citation.
Paraphrasing plagiarism changes a few words but keeps the original sentence structure or idea without attribution.
Mosaic plagiarism combines copied phrases from several sources into a new-looking paragraph.
Self-plagiarism reuses substantial parts of earlier work without explaining or citing the reuse.
Accidental plagiarism often comes from incomplete notes, missing quotation marks, or a citation that was removed during editing.
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How to avoid it
Keep source details while researching, separate your own notes from copied quotations, and cite ideas as well as exact wording. When paraphrasing, read the source, look away, write the idea in your own structure, and then compare the result with the source before adding the citation.
A plagiarism checker can help you inspect likely matches before submission. Use the highlighted passages and source context to decide whether to quote, paraphrase more independently, or add attribution.