TIFFs or TIFs, on the other hand, are less common. This allows them to look the same on any system, even if they were made on an Android phone and then opened on a MacBook. Unlike DOC files, which rely on installed fonts and operating software-specific features, PDFs are like snapshots of a document. PDFs are documents that are perfect for sharing on the internet. You probably are very familiar with Portable Document Format (PDF) files.