Maranatha Christian Academy uses several tools to educate students about plagiarism and how to avoid it. One of those tools is Turnitin.com. You can search the HelpDesk for several good articles on it!
The folks at Turnitin.com have put together a bunch of helpful resources on exactly what plagiarism is including a helpful info-graphic. Click the image below for the full graphic and other great resources.
You may also find helpful the download from this HelpDesk article, a handout they provide (see below): Plagiarism Spectrum: 10 Types of Plagiarism.