PDF

Portable Document Format (PDF): The universal, fixed-layout file format ensuring document fidelity across all operating systems and devices.

PDF (Portable Document Format) is the industry-standard file format, developed by Adobe Systems in the early 1990s, for reliably presenting and exchanging documents independent of application software, hardware, or operating systems. It encapsulates a complete description of a fixed-layout document—including the text, fonts, and graphics—required for consistent display. The format became an open standard (ISO 32000) in 2008, solidifying its role as the global benchmark for digital document exchange. Its core value proposition is simple: what you see is precisely what you get, every time, regardless of the viewing platform.

https://www.adobe.com/acrobat/online.html