Turnitin is an online tool used primarily by educational institutions to check the originality of students' work. It compares submitted documents against a vast database of academic papers, articles, and web content to identify potential plagiarism. This helps ensure that students submit original work and understand the importance of proper citation. In addition to plagiarism detection, Turnitin offers features like grading tools and feedback options for instructors. These tools allow teachers to provide comments and suggestions directly on student submissions, promoting a more interactive learning experience. Overall, Turnitin supports academic integrity and enhances the quality of education.