Plagiarism can be defined as the act of using someone else's ideas, words, or work without proper attribution.
Self-Plagiarism is the reuse of your own work without attribution, and is considered a form of plagiarism because it does not credit the original source and falsely implies that the work is newly created.
You should never re-use previous work without the explicit permission of your professor!
If the original work was published, self-plagiarism may be a violation of copyright.
Yes! If caught for plagiarism (even unintentional plagiarism) at PC, you could get an F on the assignment, get an F in the class, or be expelled from school. In "real life", plagiarizing can have even more serious consequences: