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A PDF search engine is a specialized search engine that allows users to search for and find PDF files on the internet. PDF search engines typically use web crawlers to scan the internet and index PDF files, making it easier for users to find specific documents.

Some PDF search engines are specialized and focus on specific types of documents, such as academic papers, technical manuals, or ebooks. Others are more general and allow users to search for PDF files across a wide range of topics and categories.