Which Is Right, “PDF Format” Or “PD Format”?

Hi! Everyone, hope you all are fine.
Today in this post I will tell you about PDF. Probably all of you have used PDF files and probably all of you also calls it PDF Format (including me), which is wrong. Do you know what the full form of PDF is? See the below illustration to know more

And it just not you or me who use “PDF” as “PDF format” even Adobe also use “PDF” as “PDF format” on their official site.

Now can you tell what is wrong with PDF format, HTML language, ATM machine, SMS service, LCD display or HTTP protocol?

Illustration done by Geek & Poke, via Digital Inspiration