Ryerson has a contract with Turnitin. It is an evaluative and feedback tool. One of the many ways it can be used is to ensure the originality in student papers. It can assist your Faculty/Instructors in determining the similarity between your work and work of other students who have submitted papers to the site, internet sources, and a wide range of journals and other publications. No decisions are made by the service; it simply generates an "originality report," and faculty must evaluate that report to determine if work is plagiarized.
If Turnitin.com is used in a course, students who do not want their work submitted to this service must, by the end of the second week of class, consult with the instructor to make alternate arrangements.
The Turnitin website has lots of useful information for students to understand the potential pitfalls of academic writing, citation and referencing.