Copyscape is a widely used plagiarism detection tool that helps writers, editors, and webmasters identify duplicate content on the internet. By scanning and comparing text against billions of web pages, Copyscape reveals instances where content has been copied or needs proper citation. It offers both free and premium services, including batch searches and API access. Copyscape is essential for maintaining content originality, protecting intellectual property, and avoiding penalties from search engines for duplicate content. It provides peace of mind by ensuring that published material is unique and compliant with copyright laws.