Turnitin 'in a nutshell'
"Turnitin provides originality checking, online grading and peer review to prevent plagiarism prevention and engage students in the writing process. Turnitin encourages best practices for using and citing other people's written material and offers instructors ways to save time and improve their feedback on the writing process. The service offers a complete web‐based service to manage the process of submitting and tracking papers electronically, providing better – and faster – feedback to students."
Turnitin. (2012). FAQs. Turnitin.