What is the main advantage of using Portable Document Format (PDF)?

The main advantage of using Portable Document Format (PDF) is that it preserves the visual appearance and layout of documents. This means that when a PDF is created, it retains the fonts, images, graphics, and layout exactly as intended, regardless of the software, hardware, or operating system used to view it. This consistency is particularly beneficial for documents that need to be shared across different platforms or printed while ensuring that they appear the same to everyone, eliminating any formatting issues that might arise with other document types.

The other options do not accurately reflect the core purpose of PDFs. While editing text is possible in some PDF editing software, PDFs are primarily designed to be viewed rather than edited, making editing a secondary feature rather than a primary advantage. Furthermore, PDFs are not limited to audio files; they are a versatile format that can contain text, images, and vector graphics, making the option suggesting that they are exclusively for audio files incorrect. Lastly, the assertion that PDFs can only be printed on special printers is misleading, as they can be printed on any standard printer capable of handling compatible paper sizes. Therefore, the preservation of layout and appearance stands out as the primary strength of the PDF format.