Plagiarism involves stealing someone else's work and passing it off as one's own. It can take various forms such as turning in another's work, copying text without citation, or incorrectly citing sources. Reasons students plagiarize include difficulty completing assignments and unawareness of what constitutes plagiarism. Teachers are responsible for educating students about plagiarism and avoiding assignments that may encourage copying. Plagiarism detection services check students' work against online sources but teacher-student interaction is a better approach. To prevent plagiarism, students should understand its effects, discuss difficulties with teachers, and cite sources properly.