What exactly does it mean to plagiarize? According to the WVU Campus Student Code, the term "plagiarism" means "use, by paraphrase or direct quotation, of the published or unpublished work of another person without full and clear acknowledgment, including, but not limited to, the unacknowledged use of materials prepared by another individual engaged in the selling of term papers or other academic materials" (pg. 19).
So, obviously it's not OK to copy word-for-word the work of another without proper citation. Take a look at Cornell's Guide to Academic Integrity (esp. pages 16-28) for some more examples that might be harder to spot. Here are a few:
