What Does PDF Stand For?
PDF stands for Portable Document Format. Here is why that "portable" part matters for you.
Quick answer: PDF = Portable Document Format. It is a file type designed so a document looks the same on any device, anywhere.
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Why "portable"
A PDF packages text, fonts, images, and layout into one file that renders identically whether opened on Windows, Mac, or a phone. That is the whole point.
A bit of history
Adobe created PDF in the 1990s to solve the "looks different on every computer" problem. It is now an open ISO standard.
FAQ
Who owns PDF now?
It is an open ISO standard (ISO 32000); no single company controls it.
Is PDF the same as Adobe?
Adobe invented it, but anyone can make PDF tools — like the free ones here.