PDF files are widely used for sharing documents because of their reliability and versatility. One of the key reasons PDFs are popular is their strong security features, which protect sensitive information from unauthorized access.

A primary security feature is password protection. Users can set passwords to restrict who can open, view, or edit a PDF file. Additionally, PDF documents can include permissions that limit actions such as printing, copying, or modifying content. This ensures that confidential information remains secure even when the file is shared widely.