Adobe filename extension

• Downloadable form, often
• Email attachment format
• File name ending in Adobe Acrobat
• Many a sharable PC file
• File that might be e-signed
• Computer file format( Arconym )
• .doc alternative
• Printable format
• Email attachment, briefly

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
by 1992, initialism (acronym) for portable document format , a generic term.