PDF Tools are software applications designed to create, edit, convert, and manage PDF (Portable Document Format) files. They allow users to perform various tasks, such as merging multiple documents into one, splitting a large PDF into smaller files, and converting PDFs to other formats like Word or Excel. These tools are useful for both personal and professional purposes, making it easier to share and collaborate on documents. Many PDF Tools also offer features like adding annotations, filling out forms, and securing files with passwords, enhancing the overall functionality and usability of PDF documents.