Which file format is described as Portable Document Format?

The file format referred to as Portable Document Format is PDF. This format was created by Adobe to allow documents to be shared and viewed across different systems without losing formatting. PDFs can encompass text, images, and graphics, maintaining the visual integrity of the document no matter the software or hardware used to view it. This versatility makes it a popular choice for sharing official documents, forms, and other materials that require consistent presentation.

Other formats such as JPG are primarily used for images and do not support comprehensive document features like text formatting, hyperlinks, or embedded fonts. DOCX is a Microsoft Word document format that is designed for word processing, while TXT is a plain text file format that lacks any formatting capabilities. Thus, PDF stands out as the most suitable choice when it comes to a portable, flexible document format that retains its structure across platforms.