Plagiarism is presenting someone else's words or ideas as your own. The following are all examples of plagiarism:
Celebrities can also be guilty of plagiarism! Here are a few famous examples:
You Quote It, You Note It! – This interactive online tutorial explains the differences between paraphrasing, quoting and plagiarism (and also provides some useful research tips)
Is It Plagiarism Yet? - What kind of things do you need to credit in your writing? What is common knowledge?
Safe Practices - Practical tips on how to avoid accidental plagiarism