Plagiarism is when you use someone else's ideas or words in your assignment and present them as your own. All types of information can be plagiarised - books, journal articles, websites, course notes, other students' work, even your own earlier assignments.
Some examples of plagiarism would be:
How to avoid plagiarism:
This video clip is courtesy of Vanessa Garofalo from Southeastern University
Turnitin is a piece of software that detects plagiarism - it will compare your assignment against a large database of academic writing and give you an originality rating. At AUT students are usually required to submit their assignments through Turnitin.