Definition: FPDF stands for "File Processing Format" which, in its original form was called PDF (Portable Document Format). It's a type of document format that allows users to view and edit text files, but doesn't include any features like images or graphics. Essentially, it is like a lightweight version of Adobe's PDF file format. This format was first introduced by the French company Focal Point in 1990 before gaining international acceptance in the 2000s.