Plagiarism is copying someone else's work and submitting it as your own. This includes wholesale copying from websites, reports, books, assignments taken from other students including your seniors, etc.
To know more about plagiarism, refer to:
To know more, refer to Library Essentials > Academic Integrity Essentials Guide.
NUS provides two plagiarism prevention services, i.e. Turnitin and iThenticate. Each serves a different group of users.
(i) iThenticate is for postgraduate students and academic staff/researchers to check their own work
(ii) Turnitin is for instructors to check students' work in a classroom setting
To know more, refer to CIT's Plagiarism Prevention webpage.