In the context of mainframe, Full form of PDF?
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Portable Format Reader
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Portable File Reader
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Production Development Facility
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Program Development Facility
In the mainframe context, PDF stands for Program Development Facility. It's an IBM mainframe tool used for program development, not to be confused with the more common Portable Document Format. The mainframe PDF is an interactive development environment for creating and maintaining programs on IBM mainframe systems.
In the mainframe/ISPF world, PDF stands for Program Development Facility — the ISPF component that provides the editor, browse, and utility functions programmers use to develop and manage code. It's not related to the 'Portable Document Format' file type or the other distractor phrases, which are plausible-sounding but incorrect expansions.