Plagiarism checkers are tools designed to identify instances of copied content in written work. They compare submitted text against a vast database of sources, including academic papers, websites, and books, to detect similarities. This helps ensure originality and proper attribution in writing. These tools are commonly used by students, educators, and professionals to maintain academic integrity and avoid unintentional plagiarism. Many universities and publishers require the use of plagiarism checkers before submitting work, making them an essential resource in the writing process.