Final answer:
Plagiarism means using someone else's writing without giving credit to the source. It is considered a serious academic offense.
Step-by-step explanation:
Plagiarism means using someone else's writing without giving credit to the source. This includes copying and pasting from another source without citing them or submitting an essay written by someone else as if it were your own. Plagiarism is considered a serious academic offense and can have severe consequences.