Plagiarism detection refers to the process of identifying instances where someone has copied or closely imitated another person's work without proper attribution. This can include text, images, or ideas taken from books, articles, or online sources. Various tools and software, such as Turnitin and Grammarly, are commonly used in educational and professional settings to check for originality. These tools work by comparing submitted content against a vast database of existing works. They highlight similarities and provide a percentage indicating how much of the text matches other sources. This helps ensure academic integrity and encourages original writing.