PDF files, or Portable Document Format files, are a type of digital document that preserves the formatting of a document across different devices and platforms. They can contain text, images, and graphics, making them suitable for a variety of uses, such as reports, brochures, and eBooks. One of the main advantages of PDF files is that they can be easily shared and viewed without altering the original layout. They are widely used in both personal and professional settings, and many software programs, including Adobe Acrobat, allow users to create, edit, and annotate these files.