<human>: What is the difference between a PDF file and an image file?
<bot>: The main difference between a PDF file and an image file is that a PDF file is a digital document which contains text, graphics, and other objects in a form of a Portable Document Format (PDF). An image file, on the other hand, is a single picture or photograph. A PDF file can be read by any computer program, while an image file must be viewed using a specific viewer application.