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One site I used for my research actually explained the different types of plagiarism; the first type is Complete Plagiarism, This is the most obvious case: a student submits, as his or her own work, an essay that has been written by someone else.

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The next type is called Near-complete Plagiarism, a student may lift portions of another text and use them in his or her own work, for example, a student might add her or his own conclusions or introduction to an essay, or a student might scatter his or her own comments through a text taken substantially from another source.

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The last type is called Self Plagiarism, The use of an essay written for one course to satisfy the requirements of another course is plagiarism.