A citation is a note you place in your paper, which lets the reader know whose ideas influenced your work.
Plagiarism is a serious offense. If none of the above reasons to cite moved you, the risk of plagiarizing should. Plagiarism can earn you a failing grade (some institutions immediately expel plagiarizers) and, in a professional environment, plagiarizing can get you fired. Develop good citation habits now.
Definition of Plagiarizing, from Merriam Webster's online dictionary
To steal and pass off (the ideas or words of another) as one's own: use (another's production) without crediting the source.
To commit literary theft: present as new and original an idea derived from an existing source.
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